摘要: have(has)to +动词原形 have(has)to后面要用动词原形.当主语为第三人称单数时用has to.当句子是过去时用had to. We have to leave now. 我们不得不现在就离开. He has to work on Sunday. 他不得不在周日工作. I had to do my homework last Sunday. 上周日.我不得不做作业.

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