has用作第三人稱單數(shù)形式。has具有吃、有、從事、允許等含義。had通常作動(dòng)詞have的過去式和過去分詞，表示得到，也可以用于完成時(shí)和過去完成時(shí)，表示已經(jīng)。

Have you any questions？這個(gè)have的意思是有，是實(shí)意動(dòng)詞

Do you have any questions？這個(gè)have的意思是有，也是實(shí)意動(dòng)詞

而do才是助動(dòng)詞

have只有在實(shí)意動(dòng)詞時(shí)，意思才為有

have在做情態(tài)動(dòng)詞時(shí)，充當(dāng)?shù)氖侵鷦?dòng)詞，無實(shí)際意義

1，動(dòng)詞，“有”的意思。

I have a book。我有一本書。

Do you have a book？

I don’t have a book。（也可以說I haven’t a book。不常用）

2，助動(dòng)詞?！笆埂?/strong>

have sb do 讓某人做

have sb doing 讓某人一直做

have sb/sth done 某人/某物被……

3，have to，“不得不，必須”，表示不是主觀意愿

It’s dark outside，I have to go home。天黑了，我不得不回家。

Do you have to……。

I don’t have to……。

4，用于完成時(shí)

have+動(dòng)詞的過去分詞

As Warrent's parents,you are to set a good example to him.(表責(zé)任,義務(wù),相當(dāng)于,must should) Are we to clean the corridor,Mrs Dell? (表征求意見=shall)

The temperature is to drop soon.(表示可能性)

Would she get cross if I were to sail into her of lying?(表假設(shè))