1】Jimmy is too young to go to school.
Jimmy is (not old enough ) to go to school.
[【2】My mother went to sleep,and she didn't have dinner.
My mother went to sleep(without having ) dinner.
【3】我们中的大部分人都想用自己所学的东西来做自己想做的事情.
Most of us want to use (what they learned ) to do (what they want to do ).