If you have a test tomorrow, should you study all night? Why?/Why not? I should / I'll / I'll probably / I might....
I'll / I'll probably / I might..../ I should
You need to call your parent. What should you do if your phone stops working?
If my phone stops working, I will...
What should you do if you leave your homework at home by mistake?
If I leave my homework at home by mistake, I will....