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助动词have的用法和例句

have作为助动词可以:
1.构成完成时态(have+过去分词):
What has happened?
出了什么事?
He told me Jane had left.
他告诉我简已经走了。
She will have arrived by this time tomorrow.
明天这时她就会到了。
How long have you been there?
你在那里待了多久?

2.构成完成进行时态(have+been+现在分词)
We have been trying to contact you.
我们一直在想和你联系。
She has been teaching there for thirty years.
她在那里任教达三十年。
That was the book he had been looking for.
这是他一直在找的书。

另外,have (got)to还可构成谓语,表示“不得不”:
We have(got)to be careful.
我们得小心。
You don’t have to worry.
你不必忧虑。

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