Future tenses & simple present
1. Will/Shall: (shall only with I and We)
1a. Something is going to happen in the future:
It will rain tomorrow.
I am quite sure that you will be happy.
Mind you: Shall is obliged if you propose something or if you ask for someone's preferences or decisions
Shall we go to the cinema tomorrow? (proposal)
When shall I come to your house? (preference)
How shall we tackle this problem? (decision)