wait for a flower to grow ,grow 前为什么要加to
问题描述：
wait for a flower to grow ,grow 前为什么要加to
to grow 是动词不定式吗
答
wait for sb to do sth 等着某人做某事
to do sth 是不定式做宾补
如：
I am waiting for the library to open
They are waiting for the library to open