Упражнение 417 на Future Simple

Почему мы используем Future Simple в этих предложениях? Рассортируйте.

Shall we invite Alex and Rona? I'd love to see them. →
 
A: Oh, I've broken the vase. B: Don't worry, I'll fix it. →
 
All the hotels are booked. I'm not sure I'll find anything for our dates. →
 
The air conditioning won't work. It must have broken down again. →
 
Spontaneous decision
"Doesn't want to"
Offer/request
Prediction
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