The neutral future of prediction is expressed by will (often reduced to ‘ll) + infinitive , or by shall (which is rather formal and rare and normally occurs only with a first-person subject):
- Temperatures tomorrow will be much the same as today.
- Will you come back this evening?
- We shall hear the results of the election within a week.
With personal subjects, will/shall usually suggests an element of intention:
- I’ll see you again on Tuesday.
We use will when we make a prediction based on our opinion or our past experience or when we state a decision made at the moment of speaking:
- I imagine the stadium will be full for the match on Saturday.
- It’s late. I think I’ll go to bed now.
Will can be used in the main clause of a conditional sentence when we say that something (often something negative) is conditional on something else – it will happen if smth else happens first:
- If we go on like this, we’ll lose all our money.
We use will (or another auxiliary), when we describe a future event that follows another. Often if has a meaning similar to when in this kind of sentence:
- If you look carefully, you’ll (or can) find writing scratched on the glass.