Page 648 - Practical English Usage 3ed - Michael Swan, Oxford

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Whyshould...?
A structure with why followed by should can suggest surprise. I wonder why she should want to go out with me.
The structure can also suggest anger or refusal to do something.
I don't see why we should have to pay for your mistake. Give me a cigarette. "" Why should I?
For a similar structure with how. see 482.2. infinitive structures
Why can be followed by an infinitive without to. This structure can suggest that an action is unnecessary or pointless.
Why argue with him? He'll never change his mind. (NOT i'Rt, arKfting ...? OR yilt,t6argue...?)
Why pay more at other shops? We have the best value. Why not + infinitive without to is used to make suggestions.
Sandy's in a bad mood. "" Why not give her some flowers? Why don't ...? can be used in the same way.
Why don't you give her some flowers? Why don't we go and see Julie?
will: various uses forms
Will is a modal auxiliary verb (see 353-354). It has no -s in the third person singular; questions and negatives are made without do; after will, we use an infinitive without to.
Will the train be on time? Contractions are 'II, won't.
Do you think it'll rain? It won't rain.
Would is used as a past or less definite form of will for some of its meanings; for details, see 633.
future auxiliary
We can use will as an auxiliary verb when we talk about the future. For details, see 212.
I will be happy when this is finished.
This time tomorrow I'll be sitting in the sun.
He will have finished the whole job by this evening.
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3 certainty
Will can express certainty or confidence about present or future situations. As I'm sure you wUl understand, we cannot wait any longer for our order. Don't phone them now - they'll be having dinner.
There's somebody coming up the stairs. "" That'll be Mary.
Tomorrow will be cloudy, with some rain. Will have + past participle refers to the past.
Dear Sir, You will recently have received a form . ..
We can't go and see them now - they'll have gone to bed.
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