he really wants to be an actor为什么是to be an actor,to be really 到句中是起到什么作用want to be 是一个规定的句型吗?

问题描述:

he really wants to be an actor
为什么是to be an actor,to be really 到句中是起到什么作用
want to be 是一个规定的句型吗?