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Which is the correct use of these two words, and in which context should one be used rather than the other?

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Another interesting and important question is why we have these two words to form the future tense? What's the origin of the words, and why have both survived? Will both survive? –  Charlie Aug 6 '10 at 1:14
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It is very interesting to see answers to related question that @Edward Tanguay included in his answer: "I often have wondered in which parts of the world (England?) and which social echelons using "shall" in statements is actually still practiced by native speakers?" –  rem Aug 7 '10 at 17:04
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In the US defense industry, product specifications contain the word "shall" to identify contractual obligations as in "The system shall handle 100 widgets per second". If the word "will" replaced shall in that sentence, the requirement would not be considered a contractual obligation. The people who write system specifications and statements of work use "shall" throughout engineering documents to indicate those capabilities the system must have to meet the spec. Yes the language sounds stilted, but every "shall" reinforces the contractual nature of the requirement. –  John Satta Jan 14 '11 at 20:45
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@John S: not just in the defense industry, it's common in formal requirement specifications. (e.g. in the medical products industry as well) –  sibbaldiopsis Apr 16 '11 at 15:09
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When you attend your local Renaissance Festival. –  patrick Sep 8 '11 at 16:04
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10 Answers

Here is a good description of when to use shall:

...shall is used for the future tense with the first-person pronouns I and We: I shall, we shall. Will is used with the first-person (again, I refer to traditional usage) only when we wish to express determination. The opposite is true for the second-person (you) and third-person (he, she, it, they) pronouns: Will is used in the future tense, and shall is used only when we wish to express determination or to emphasize certainty.

However, growing up as a native American speaker in Colorado, I never used "shall" in normal speech. However, I believe in questions it has become more common, e.g. Shall we go? but an American native speaker saying e.g. "I shall do that for you" will almost always sound affected or connote a Shakespearean context. I often have wondered in which parts of the world (England?) and which social echelons using "shall" in statements is actually still practiced by native speakers.

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"I shall" sounds odd in colloquial British English too. –  psmears Jan 12 '11 at 20:38
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@Noldorin that is the connotation given by the use of "shall" it seems. When imagining someone saying "You shall (not) do this.", I imagine a figure in authority attempting to be overbearing. Thinking along the lines of the 10 commandments "Thou shalt not", the word of someone in authority telling you how to do something. –  Brett Allen Feb 20 '11 at 20:41
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The main place I've seen the word used is in rulebooks, emphasizing the connotation of certainty; "when a penalty is called, the official shall place the puck at the closest face-off circle..." etc. As was said, it's all about the authoritative connotation of that word versus "will". –  KeithS Jun 14 '11 at 21:21
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As an Englishman living in Ireland I'm still aware of the difference here. My Irish wife will usually say "will we go to the cinema today?" which still sounds to my ears like she's asking me to predict the future, whereas she's clearly expressing intent. Needless to say I seldom say "should we go to the cinema?" these days as it sounds to Irish ears old-fashioned and a bit snooty :) –  tinyd Aug 15 '11 at 16:16
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@edward-tanguay A Concise Grammar of Contemporary English by Randolph Quirk and Sidney Greenbaum says this: "Will for future can be used in all persons throughout the English-speaking world, whereas shall (for 1st person) is largely restricted in this usage to southern British English." (§3.37, page 47) The book is from 1973, so it won't be completely current, but that gives some relatively recent indication. –  user46705 Jun 27 '13 at 10:24
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Don't forget that 'shall' at the start of a question is used to make a suggestion:

Shall we play tennis?

But 'will' at the start of a question does not have the same meaning:

Will we play tennis?

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"not the same meaning" is not clear enough for non-native speakers –  belisarius Sep 10 '11 at 20:34
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http://en.wikipedia.org/wiki/Shall_and_will

Shall and will are both modal verbs in English used to express propositions about the future. According to the New Oxford Dictionary of English, In modern English the interchangeable use of shall and will is an acceptable part of standard British and US English.

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This is a bit too generalised. 'Acceptable' by whose standards? –  Matt Sep 12 '11 at 17:14
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It's not quite even true. In most dialects, shall and will are not interchangeable in first person questions. –  Peter Shor Apr 3 '12 at 18:45
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"Shall" originally indicated owing to do something. "Will" originally, and sometimes still, indicates a desire to do something. Eventually, they both came to indicate the future, but "will" usurped the place of "shall," at least in my part of Virginia. As far as I can tell, "'ll" has since taken the place of will. :)

EDIT: Should have included a link or two to begin with, not to mention double-checked my answer. Whoops, sorry.

Etymology of "will": http://www.etymonline.com/index.php?term=will

And as opposed to "shall": http://www.etymonline.com/index.php?term=shall

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"Would" indicates a desire. "Will" does not. –  Vincent McNabb Aug 13 '10 at 5:43
    
@Vincent: Actually, I did misremember the meaning of "shall," but will does indicate desire. I'm editing in a link. –  kitukwfyer Aug 13 '10 at 13:54
    
is right. Will does indeed indicate desire. –  Noldorin Jan 14 '11 at 19:57
    
+1 for the etymologies! I didn't know that site existed, looks like a great resource. –  Noldorin Jan 14 '11 at 19:57
    
See my comment to the OP that "shall" is a legal contractual obligation (in the US defense industry) and "will" or any other word indicates just "nice to have". –  John Satta Jan 14 '11 at 20:48
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The note about the usage of shall in the New Oxford American Dictionary is the following:

There is considerable confusion about when to use shall and will.

The traditional rule in standard English is that shall is used with first person pronouns (I and we) to form the future tense, while will is used with second and third persons (you, he, she, it, they): I shall be late; she will not be there.

When expressing a strong determination to do something, the traditional rule is that will is used with the first person, and shall with the second and third persons: I will not tolerate this; you shall go to school.

In practice, however, shall and will are today used more or less interchangeably in statements (although not in questions). Given that the forms are frequently contracted (we'll, she'll, etc.), there is often no need to make a choice between shall and will, another factor no doubt instrumental in weakening the distinction. In modern English, the interchangeable use of shall and will is an acceptable part of standard U.S. and British English.

When I started my classes on British English, I was taught that I shall go home was the future tense of I go home; asking to a person living in the east coast of the USA, I learned that I shall be late (or I shall return) has a slightly different meaning from I will be late (or I will return), at least in some contexts.

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+1 Interesting. As an example of "will" to indicate a strong determination to do something: "Will you marry me?" –  b.roth Aug 13 '10 at 10:49
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@Bruno Rothgiesser: Yes, indeed. Another interesting example of the way the two words are sometimes used to express different shades of meaning is the story of two (hypothetical) drowning men - one calls "I shall drown, and nobody will save me"; the other "I will drown and nobody shall save me". The former gets rescued (because he is expressing his fear); the latter does not (because he is expressing his determination to perish)! –  psmears Jan 12 '11 at 20:41
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Another distinction I've heard people make is that "shall" implies a deliberate action and "will" implies a result ("I shall sing and the crystal will crack"). Strictly conversations, so no authorities to quote here.

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Yes in some cases, no in others, but the differences, if ever they existed, have become blurred lately. –  Kaiser Octavius Jun 26 '13 at 13:18
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In some situations will and shall may point to different sources of motivation to act in a particular way—namely, an internal source versus an external source. As an example (in the third-person singular) of the compulsory aspect of shall versus the volitional aspect of will, consider this exchange from Henry James's short story "Covering End":

“And what has she [Cora Prodmore, Mr. Prodmore's daughter],” he [Mr. Prodmore] appealed, “expected me to give up? What but the desire of my heart and the dream of my life? Captain Yule announced to me but a few minutes since his intention to offer her his hand.”

She [Mrs. Gracedew] faced him on it as over the table. “Well, if he does, I think he’ll simply find —”

“Find what?” They looked at each other hard.

“Why, that she won’t have it.”

Oh, Mr. Prodmore now sprang up. “She will!”

“She won’t!” Mrs. Gracedew more distinctly repeated.

“She shall!” returned her adversary, making for the staircase with the evident sense of where reinforcement might be most required.

Mrs. Gracedew, however, with a spring, was well before him. “She shan’t!” She spoke with positive passion and practically so barred the way that he stood arrested and bewildered, and they faced each other, for a flash, like enemies.

The progression here is from Mr. Prodmore's emphatic "She will!"—his assertion that Cora Prodmore will marry Captain Yule of her own volition—to his even more emphatic "She shall!"—his assertion that she will do so under pressure from Mr. Prodmore. Though in the first instance Mr. Prodmore has no doubt that his daughter accepts the inevitability of the marriage that he intends to bring about, his authoritarian intensity increases in the second instance as he shifts from expressing confidence in her intentions to expressing confidence in his ability to force his expectations upon her.

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In some contexts, such as legal contracts or formal standards, shall indicates an obligation or command, whereas will might be interpreted as an observation or prediction.

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shall/should is stronger and heavier in emphasis than will/would. Eg. statements that I can think off right off my mind for comparison in connotation would be:

He shall/should be doing it.

versus.

He will/would be doing it.

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Collins English Dictionary defines 'will' and 'shall' as follow:

Will: (you, he, she, it, they, or a noun as subject) used as an auxiliary to make the future tense.

Shall: (I or we as subject) used as an auxiliary to make the future tense.

So:

  • I shall be at home tonight.

  • Will you come round.

Let us use 'will' instead of 'shall', if we want to emphasize. So:

  • I will be ready on time, I promise.

  • I do not care what your wicked stepmother says: you shall go to the ball.

But if you want to see what may happen when we reverse 'will' with 'shall', and vice versa, read the following sentences:

  • I shall drown, no one will save me. (I should like to be saved but everyone is ignoring me.)

  • I will drown, no one shall save me. (I am determined to drown. I forbid anyone to throw a life belt.)

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The dictionary might say that, but no one uses 'shall' in AmE (it's recognizable from the Christian Ten Commandments an legal documents, but no one would naturally use it in speech or writing). I don't know about BrE. –  Mitch Apr 5 '12 at 13:43
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