Упражнение 417 на Future Simple

Почему мы используем Future Simple в этих предложениях? Рассортируйте.

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
"Doesn't want to"
Spontaneous decision
Prediction
Пропустить