had to do是谓语吗

是谓语如：

Fifteen policemen had to push very hard to get him off the main street

He had to look after his sister yesterday. 他昨天不得照顾他的妹妹。

谓语为：had to ……属于“情态动词+动词原形”构成复合谓语

又如：

We have had to turn down four applicants already. 我们已经不得不回绝了四位申请人

have to 相当于情态动词 musthave to+动词原形 共同做谓语

如：

We have to take umbrellas when it is rains

have to do的非限定形式：

He has had to do his homework.  had为过去分词。

To climb the rock face， we had to take various precautions

谓语 had to take 的目的—— “ 为了爬过 the rock face ” 。

had to do是谓语吗

have

to

do是个固定短语，意思是不得不做，"做"，即“do''是谓语动词，have

to

做情态动词，do即谓语，“have

to

do”是“情态动词加谓语”的结构，而不单单是谓语，因为do的是homework，而不是"have

to