助動(dòng)詞have(has, had, having)的用法

(1)助動(dòng)詞have可以構(gòu)成完成時(shí)或完成進(jìn)行時(shí)

He has been a doctor for 10 years.他當(dāng)醫(yī)生十年了。This is the place I have been longing to visit.這就是我一直渴望參觀的地方。

(2)和不定式構(gòu)成謂語，表示客觀上不得不做的事情。We've missed the train. We'll have to wait for another one.我們己經(jīng)誤了火車，我們只能等下一列。

-Do we have to start work?我們得立刻工作嗎?

-No. We don't have to.不，不必了。

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