do you have to buy this hat?Do you have to buy this hat?这句话为什么have后加to了?不是使役动词吗?

do you have to buy this hat?Do you have to buy this hat?这句话为什么have后加to了?不是使役动词吗?
do you have to buy this hat?
Do you have to buy this hat?这句话为什么have后加to了?不是使役动词吗?

do you have to buy this hat?Do you have to buy this hat?这句话为什么have后加to了?不是使役动词吗?
have to不得不,必须.在这里不是使役动词.这句话的意思是：
你必须买这顶帽子吗?
或者：你非得买这顶帽子不可吗?

have to do sth.表示不得不做某事,不做使役动词

have 加上to构成固定搭配（不得不）这句话意思：你 非要买这顶帽子吗？have 在和其他介词搭配时有其他意思，并不固定，要学会灵活运用