how long have you had to wait?had 如果是现在完成时,wait为什么不加ed,

来源：学生作业学帮网编辑：学帮网时间：2024/05/31 10:13:34

have to 不得不的意思.
既然是现在完成时了,have变了,其他动词就不用再变
wait 在to后面
∴用原型的.

have to do 是“不得不”的意思，固定搭配

have to 不得不，后接动词原形，故wait 不能加ed，另外，这句是现在完成时，had 就是过去分词。

have to是不得不的意思，have to 后加原型

是完成时没有错过去式用在了had身上而wait前面是had to 所以要用原型

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