◎ 兩者都表示“必須,不得不”,to后要加動詞原形。have to的否定式為haven't to或don't have to,疑問式為Have you…?或Do you have to…?并可以與shall,will或情態(tài)動詞連用,如will have to等。have got to的否定式只有一種形式haven't got to,疑問式也只有一種形式:Have you got to…?并且不可同助動詞或情態(tài)動詞連用。
比較
I have to leave now. 我現(xiàn)在得走了。
I haven't to leave now.
I don't have to leave now.
Have you to leave now?
I shall have to leave now.
I have got to go there.
我必須到那里去。
I haven't got to go there.
Have you got to go there?
I shall have got to go there.
Do we have got to do it again?
Do we have to do it again?
我們必須再做那件事嗎?