Future Simple (summary) – Exercise 417

Why do we use the future simple in these sentences? Sort out.

I think the rain will start within an hour. →
 
Shall I close the window? It's a bit cold in here. →
 
I keep pressing the button, but the lift won't move. I'm stuck. →
 
A: I can't reach Mr Lee. B: I'll text him. →
 
Offer/request
Prediction
Spontaneous decision
"Doesn't want to"
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