modal showing future willingness

prediction based on evidence

subordinate conditional clause

unusual certainty

timetabled event

planned event

prediction based on past experience

spontaneous decision

non-future modal use of will for deduction

'going to' future

I will explain it to you clearly

The future fulfilment of the present

He'll never agree

Do you think so? I'll look it up.

The examination takes place here.

That bull's going to charge.

The damp will be caused by poor plasterwork

You are taking the examination here.

The comet returns every 20 years.

The deposit is returnable providing the house is left clean