had to do是謂語嗎

是謂語如：

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

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

謂語為：had to ……屬於“情態動詞+動詞原形”構成複合謂語

又如：

We have had to turn down four applicants already. 我們已經不得不回絕了四位申請人

have to 相當於情態動詞 musthave to+動詞原形 共同做謂語

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為過去分詞。

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

謂語 had to take 的目的—— “ 為了爬過 the rock face ” 。

had to do是謂語嗎

have

to

do是個固定短語，意思是不得不做，"做"，即“do''是謂語動詞，have

to

做情態動詞，do即謂語，“have

to

do”是“情態動詞加謂語”的結構，而不單單是謂語，因為do的是homework，而不是"have

to