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

He'll never agree

The comet returns every 20 years.

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

You are taking the examination here.

The damp will be caused by poor plasterwork

The deposit is returnable providing the house is left clean

The future fulfilment of the present

I will explain it to you clearly

That bull's going to charge.

The examination takes place here.