to+动词和动词+to的不同.如：come to和to come等

看句型
比如 I want to eat to do the work.
to eat 作WANT的宾 而 eat to do the work ,to do 作EAT的补
做动词的补语的动词要用TO 来连接
COME TO 是去SW
COME TO + 名词或从句