When should I use “shall” versus “will”?
I have learnt in school we should use shall with I, you and we. But I often see people saying I will, you will or we will. Is this correct?
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From Fowler's Modern English Usage:
In the first person 'shall has, from the early ME period, been the normal auxiliary for expressing mere futurity without any adventitious notion'.
It then carries on for two full pages of fine print.
The short version is that if the subject is "I" or "we", and the sentence is not a question, then "shall" has traditionally been correct, and "will" has traditionally expressed a level of determination, or a promise. Today though, the two are interchangeable. I tend to use "shall" (note that I am neither British nor American); many people tend to use "will".
If the subject is NOT "I" or "we", then the future tense has "will". In this case, "shall" means something more like "must" - that is, the Old Testament sentence "you shall not kill" is a commandment, not a prediction of the future.
If the subject is "I" or "we", and the sentence is a question, then "shall" is an offer or a suggestion ("shall we dance?", "shall I pay for dinner?"); but "will" is asking what is going to happen.
In modern (non-legal) American English, the modal auxiliary shall is not used, except in two idiomatic constructions, both first person, both questions, and both involving invitations and offers:
Plural Shall we? can occur alone as a tag for an invitation starting with Let's:
and can also start a question signalling a request for cooperation and agreement:
Singular Shall I? occurs in similar situations, as a tag for an offer starting with Let me (though not with Let's, which is plural).
or starting off a question that conveys an offer:
Other than those constructions, any use of shall by a native speaker of American English is being read aloud (or is being recited from memory) from an archaic formal, written source (e.g, Congress shall make no law ..., Thou shalt not ...).