May occurs in fixed phrases like:
May God be with you! May you live to be a hundred! May can also be used in the sense of 'We hope very much that...':
May there never be a nuclear war'
11 Modal auxiliaries and related verbs
11.72 'May/might'
11.72.1 'May/might (just) as well'
May as well and might as well can be used interchangeably to express the idea 'it makes no difference':
It's not very far, so we may/might as well go on foot May as well and might as well can differ as follows:
Shall we walk or take a bus?
- We may/might as well walk (i.e. it makes no difference) What a slow bus this is1
- Yes, we might (Not *may*) just as well walk (i.e we'd get there more quickly)
11.72.2 'May/might/could well' = 'it is extremely likely'
May well might well and could well can be used interchangeably: He may/might/could well find that the course is too difficult
11.72.3 'May/might' in the sense of I grant you...'
This construction is often used in discussion and argument. Your typewriter may/might be a wonderful machine, but it's still old-fashioned compared with a word-processor
Might/could (at least)' in nagging complaints/reproach
You might (at least) clean the bathtub after you've used iV (I) might have + past participle of verbs like guess, know and suspect can reinforce complaint:
/ might have guessed he 'd fail to read the instructions
Might' in requests
Might can replace the imperative [> 9.52] in:
While you re out you might (no stress) post this letter for me
11.73 'Shall'
Apart from its main uses with I/we to refer to the future [> 9.36], and to make offers/suggestions [> 11.39-40], shall can be used with other persons (you, he, they, etc.) in e.g. the following ways [compare > 11.23]:
You shall pay for this (threat)
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You shall (stressed) have a car for your birthday (promise)
They shall not pass! (determination)
When he comes in nobody shall say a word [> 9.54n5] (order)
11.74 'Won't/wouldn't' and 'would/wouldn't'
11.74.1 'Won't' and 'wouldn't' for 'refusal'
Won't and wouldn't are commonly used to express refusal in the
present and the past:
Drink your milk, Jimmy1 - I won't (Also, BrE: I shan't!) I offered Jimmy some milk, but he wouldn't drink it
'Refusal' (or resistance to effort) can be extended to things: The car won't start The car wouldn't start this morning