Historically, prescriptive grammar stated that, when expressing pure futurity (without any additional meaning such as desire or command), shall was to be used when the subject was in the first person, and will in other cases (e.g., "On Sunday, we shall go to church, and the preacher will read the Bible.") This rule is no longer commonly adhered to by any group of English speakers, and will has essentially replaced shall in nearly all contexts.
Shall is, however, still widely used in bureaucratic documents, especially documents written by lawyers. Owing to heavy misuse, its meaning can be ambiguous and the United States government's Plain Language group advises writers not to use the word at all. Other legal drafting experts, including Plain Language advocates, argue that while shall can be ambiguous in statutes (which most of the cited litigation on the word's interpretation involves), court rules, and consumer contracts, that reasoning does not apply to the language of business contracts. These experts recommend using shall but only to impose an obligation on a contractual party that is the subject of the sentence, i.e., to convey the meaning "hereby has a duty to."
The verb shall derives from Old English sceal. Its cognates in other Germanic languages include Old Norse skal, German soll, and Dutch zal; these all represent *skol-, the o-grade of Indo-European *skel-. All of these verbs function as auxiliaries, representing either simple futurity, or necessity or obligation.
The verb will derives from Old English willan, meaning to want or wish. Cognates include Old Norse vilja, German wollen (ich/er/sie will, meaning I/he/she want/s to), Dutch willen, Gothic wiljan. It also has relatives in non-Germanic languages, such as Latin velle ("wish for") and voluptas ("pleasure"), and Polish woleć ("prefer"). All of these forms derive from the e-grade or o-grade of Indo-European *wel-, meaning to wish for or desire. Within English, the modal verb will is also related to the noun will and the regular lexical verb will (as in "She willed him on").
Early Germanic did not inherit any Proto-Indo-European forms to express the future tense, and so the Germanic languages have innovated by using auxiliary verbs to express the future (this is evidenced in Gothic and in the earliest recorded Germanic expressions). In English, shall and will are the auxiliaries that came to be used for this purpose. (Another one used as such in Old English was mun, which is related to Scots maun and Modern English must.)
Both shall and will come from verbs that had the preterite-present conjugation in Old English (and generally in Germanic), meaning that they were conjugated using the strong preterite form (i.e. the usual past tense form) as the present tense. Because of this, like the other modal verbs, they do not take the usual -s in Modern English's third-person singular present; we say she shall and he will – not *she shalls, and not *he wills (except in the sense of "to will" being a synonym of "to want" or "to write into a will"). Archaically, there were however the variants shalt and wilt, which were used with thou.
Both verbs also have their own preterite (past) forms, namely should and would, which derive from the actual preterites of the Old English verbs (made using the dental suffix that forms the preterites of weak verbs). These forms have developed a range of meanings, frequently independent of those of shall and will (as described in the section on should and would below). Aside from this, though, shall and will (like the other modals) are defective verbs – they do not have other grammatical forms such as infinitives, imperatives or participles. (For instance, I want to will eat something or He's shalling go to sleep do not exist.)
Both shall and will may be contracted to -’ll, most commonly in affirmative statements where they follow a subject pronoun. Their negations, shall not and will not, also have contracted forms: shan't and won't (although shan't is rarely used in North America, and is becoming rarer elsewhere too).
The pronunciation of will is //, and that of won't is //. However shall has distinct weak and strong pronunciations: // when unstressed, and // when stressed. Shan't is pronounced // in England, New Zealand, South Africa etc.; in North America (if used) it is pronounced //, and both forms are acceptable in Australia (due to the unique course of the trap–bath split).
The modal verbs shall and will have been used in the past, and continue to be used, in a variety of meanings. Although when used purely as future markers they are largely interchangeable (as will be discussed in the following sections), each of the two verbs also has certain specific uses in which it cannot be replaced by the other without change of meaning.
The most common specific use of shall in everyday English is in questions that serve as offers or suggestions: "Shall I ...?" or "Shall we ...?" These are discussed under § Questions below.
In statements, shall has the specific use of expressing an order or instruction, normally in elevated or formal register. This use can blend with the usage of shall to express futurity, and is therefore discussed in detail below under § Colored uses.
Will (but not shall) is used to express habitual action, often (but not exclusively) action that the speaker finds annoying:
Similarly, will is used to express something that can be expected to happen in a general case, or something that is highly likely at the present time:
The other main specific implication of will is to express willingness, desire or intention. This blends with its usage in expressing futurity, and is discussed under § Colored uses. For its use in questions about the future, see § Questions.
Both shall and will can be used to mark a circumstance as occurring in future time; this construction is often referred to as the future tense of English. For example:
When will or shall directly governs the infinitive of the main verb, as in the above examples, the construction is called the simple future. Future marking can also be combined with aspectual marking to produce constructions known as future progressive ("He will be working"), future perfect ("He will have worked") and future perfect progressive ("He will have been working"). English also has other ways of referring to future circumstances, including the going to construction, and in many cases the ordinary present tense – details of these can be found in the article on the going-to future.
The verbs will and shall, when used as future markers, are largely interchangeable with regards to literal meaning. Generally, however, will is far more common than shall. Use of shall is normally a marked usage, typically indicating formality and/or seriousness and (if not used with a first person subject) expressing a colored meaning as described below. In most dialects of English, the use of shall as a future marker is viewed as archaic.
Will is ambiguous in first-person statements, and shall is ambiguous in second- and third-person statements. A rule of prescriptive grammar was created to remove these ambiguities, but it requires that the hearer or reader understand the rule followed by the speaker or writer, which is usually not the case. According to this rule, when expressing futurity and nothing more, the auxiliary shall is to be used with first person subjects (I and we), and will is to be used in other instances. Using will with the first person or shall with the second or third person is asserted to indicate some additional meaning in addition to plain futurity. In practice, however, this rule is not observed – the two auxiliaries are used interchangeably, with will being far more common than shall. This is discussed in more detail in the following sections.
According to Merriam Webster's Dictionary of English Usage, the distinction between shall and will as future markers arose from the practice of Latin teaching in English schools in the 14th century. It was customary to use will to translate the Latin velle (meaning to wish, want or intend); this left shall (which had no other equivalent in Latin) to translate the Latin future tense. This practice kept shall alive in the role of future marker; it is used consistently as such in the Middle English Wycliffe's Bible. However, in the common language it was will that was becoming predominant in that role. Chaucer normally uses will to indicate the future, regardless of grammatical person.
An influential proponent of the prescriptive rule that shall is to be used as the usual future marker in the first person was John Wallis. In Grammatica Linguae Anglicanae (1653) he wrote: "The rule is [...] to express a future event without emotional overtones, one should say I shall, we shall, but you/he/she/they will; conversely, for emphasis, willfulness, or insistence, one should say I/we will, but you/he/she/they shall".
Henry Watson Fowler wrote in his book The King's English, regarding the rules for using shall vs. will, the comment "the idiomatic use, while it comes by nature to southern Englishmen ... is so complicated that those who are not to the manner born can hardly acquire it". The Pocket Fowler's Modern English Usage, OUP, 2002, says of the rule for the use of shall and will: "it is unlikely that this rule has ever had any consistent basis of authority in actual usage, and many examples of [British] English in print disregard it".
Nonetheless, even among speakers (the majority) who do not follow the rule about using shall as the unmarked form in the first person, there is still a tendency to use shall and will to express different shades of meaning (reflecting aspects of their original Old English senses). Thus shall is used with the meaning of obligation, and will with the meaning of desire or intention.
An illustration of the supposed contrast between shall and will (when the prescriptive rule is adhered to) appeared in the 19th century, and has been repeated in the 20th century and in the 21st:
A more popular illustration of the use of "shall" with the second person to express determination occurs in the oft-quoted words the fairy godmother traditionally says to Cinderella in British versions of the well-known fairy tale: "You shall go to the ball, Cinderella!"
The use of shall as the usual future marker in the first person nevertheless persists in some more formal or elevated registers of English. An example is provided by the famous speech of Winston Churchill: "We shall fight on the beaches, we shall fight on the landing grounds, we shall fight in the fields and in the streets, we shall fight in the hills; we shall never surrender.'"
Whether or not the above-mentioned prescriptive rule (shall for the unmarked future in the first person) is adhered to, there are certain meanings in which either will or shall tends to be used rather than the other. Some of these have already been mentioned (see the Specific uses section). However, there are also cases in which the meaning being expressed combines plain futurity with some additional implication; these can be referred to as "colored" uses of the future markers.
Thus shall may be used (particularly in the second and third persons) to imply a command, promise or threat made by the speaker (i.e. that the future event denoted represents the will of the speaker rather than that of the subject). For example:
In the above sentences, shall might be replaced by will without change of intended meaning, although the form with will could also be interpreted as a plain statement about the expected future. The use of shall is often associated with formality and/or seriousness, in addition to the coloring of the meaning. For some specific cases of its formal use, see the sections below on § Legal use and § Technical specifications.
(Another, generally archaic, use of shall is in certain dependent clauses with future reference, as in "The prize is to be given to whoever shall have done the best." More normal here in modern English is the simple present tense: "whoever does the best"; see Uses of English verb forms § Dependent clauses.)
On the other hand, will can be used (in the first person) to emphasize the willingness, desire or intention of the speaker:
Most speakers have will as the future marker in any case, but when the meaning is as above, even those who follow or are influenced by the prescriptive rule would tend to use will (rather than the shall that they would use with a first person subject for the uncolored future).
The division of uses of will and shall is somewhat different in questions than in statements; see the following section for details.
In questions, the traditional prescriptive usage is that the auxiliary used should be the one expected in the answer. Hence in enquiring factually about the future, one could ask: "Shall you accompany me?" (to accord with the expected answer "I shall", since the rule prescribes shall as the uncolored future marker in the first person). To use will instead would turn the question into a request. In practice, however, shall is almost never used in questions of this type. To mark a factual question as distinct from a request, the going-to future (or just the present tense) can be used: "Are you going to accompany me?" (or "Are you accompanying me?").
The chief use of shall in questions is with a first person subject (I or we), to make offers and suggestions, or request suggestions or instructions:
This is common in the UK and other parts of the English-speaking world; it is also found in the United States, but there should is often a less marked alternative. Normally the use of will in such questions would change the meaning to a simple request for information: "Shall I play goalkeeper?" is an offer or suggestion, while "Will I play goalkeeper?" is just a question about the expected future situation.
The above meaning of shall is generally confined to direct questions with a first person subject. In the case of a reported question (even if not reported in the past tense), shall is likely to be replaced by should or another modal verb such as might: "She is asking if she should open a window"; "He asked if they might dance."
The auxiliary will can therefore be used in questions either simply to enquire about what is expected to occur in the future, or (especially with the second person subject you) to make a request:
Bryan Garner and Justice Scalia in Reading Law: The Interpretation of Legal Texts describe that some legal drafting has sloppy use of the word “shall”.:1808 Nevertheless, Garner and Scalia conclude that when the word "shall" can reasonably be understood as mandatory, it ought to be taken that way.:1849 In 2007 the U.S. Supreme Court said ("The word `shall' generally indicates a command that admits of no discretion on the part of the person instructed to carry out the directive"); Black's Law Dictionary 1375 (6th ed. 1990) ("As used in statutes ... this word is generally imperative or mandatory").
Legislative acts and contracts sometimes use "shall" and "shall not" to express mandatory action and prohibition. However, it is sometimes used to mean "may" or "can". The most famous example of both of these uses of the word "shall" is the United States Constitution. Claims that "shall" is used to denote a fact, or is not used with the above different meanings, have caused discussions and have significant consequences for interpreting the text's intended meaning. Lawsuits over the word's meaning are also common.
In many requirement specifications, particularly involving software, the words shall and will have special meanings. Most requirement specifications use the word shall to denote something that is required, while reserving the will for simple statement about the future (especially since "going to" is typically seen as too informal for legal contexts). However, some documents deviate from this convention and use the words shall, will, and should to denote the strength of the requirement. Some requirement specifications will define the terms at the beginning of the document.
On standards published by International Organization for Standardization (ISO), IEC (International Electrotechnical Commission), ASTM (American Society for Testing and Materials), IEEE (Institute of Electrical and Electronics Engineers), requirements with "shall" are the mandatory requirements, meaning, "must", or "have to". The IETF (Internet Engineering Task Force) defines shall and must as synonymous terms denoting absolute requirements, and should as denoting a somewhat flexible requirement, in RFC documents.
On specifications and standards published by the United States Department of Defense (DoD), requirements with "shall" are the mandatory requirements. (“Must” shall not be used to express mandatory provisions. Use the term “shall.”) “Will” declares intent or simple futurity, and “should” and “may” express nonmandatory provisions.
Outside DoD, other parts of the U.S. government advise against using the word shall for three reasons: it lacks a single clear meaning, it causes litigation, and it is nearly absent from ordinary speech. The legal reference Words and Phrases dedicates 76 pages to summarizing hundreds of lawsuits that centered around the meaning of the word shall. When referencing a legal or technical requirement, Words and Phrases instead favors must while reserving should for recommendations.
As noted above, should and would originated as the preterite (past tense) forms of shall and will. In some of their uses they can still be identified as past (or conditional) forms of those verbs, but they have also developed some specific meanings of their own.
The main use of should in modern English is as a synonym of ought to, expressing quasi-obligation, appropriateness, or expectation (it cannot be replaced by would in these meanings). Examples:
Other specific uses of should involve the expression of irrealis mood:
The main use of would is in conditional clauses (described in detail in the article on English conditional sentences):
In this use, would is sometimes (though rarely) replaced by should when the subject is in the first person (by virtue of the same prescriptive rule that demands shall rather than will as the normal future marker for that person). This should is found in stock phrases such as "I should think" and "I should expect". However its use in more general cases is old-fashioned or highly formal, and can give rise to ambiguity with the more common use of should to mean ought to. This is illustrated by the following sentences:
In archaic usage would has been used to indicate present time desire. "Would that I were dead" means "I wish I were dead". "I would fain" means "I would gladly".
More details of the usage of should, would and other related auxiliaries can be found in the article on English modal verbs.
When would and should function as past tenses of will and shall, their usage tends to correspond to that of the latter verbs (would is used analogously to will, and should to shall).
Thus would and should can be used with "future-in-the-past" meaning, to express what was expected to happen, or what in fact did happen, after some past time of reference. The use of should here (like that of shall as a plain future marker) is much less common and is generally confined to the first person. Examples:
Would can also be used as the past equivalent of will in its other specific uses, such as in expressing habitual actions (see English markers of habitual aspect#Would):
In particular, would and should are used as the past equivalents of will and shall in indirect speech reported in the past tense:
As with the conditional use referred to above, the use of should in such instances can lead to ambiguity; in the last example it is not clear whether the original statement was shall (expressing plain future) or should (meaning "ought to"). Similarly "The archbishop said that we should all sin from time to time" is intended to report the pronouncement that "We shall all sin from time to time" (where shall denotes simple futurity), but instead gives the highly misleading impression that the original word was should (meaning "ought to").
“I will drown, no one shall save me!”).
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