have+宾语+动词原形

sth be had to do
类似的用法还有：make，let等。这几个词的特点是跟不带to的动词不定式，在变成被动语态时，需要把那个to恢复出来。

My mother had me help her to clean the windows.
被动：I was had to help my mother to clean the windows.
have在这个结构里是一个“使役动词”，变为被动的时候to要加上。