Упражнение 417 на Future Simple

Почему мы используем Future Simple в этих предложениях? Рассортируйте.

A: This bag is too heavy. B: I'll carry it! →
 
I keep asking him what happened, but he won't tell. →
 
Will you keep quiet, please! →
 
Everything will be fine, I'm sure. →
 
Offer/request
Spontaneous decision
Prediction
"Doesn't want to"
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