大师作文网请问:hadn't done 和hasn't done 和has to do 有什么不同?
来源：学生作业帮 编辑：大师作文网作业帮 分类：英语作业 时间：2024/09/29 03:29:16
请问:hadn't done 和hasn't done 和has to do 有什么不同?
还有had to do
还有had to do
这是关于have的一些用法
1、have的第三人称单数为has
故has to do为第三人称“它/他/她”的用词,其中包含短语“has to+动词原型”,意为“必须得去某事”；
故hasn't done=has not done是现在完成式has done的否定式,意为“到目前为止,还没有完成某事”.
2、have或has的过去式和过去分词为had
故hadn't done=had not done,是过去完成式had done的否定式,意为“过去没有做过某事”.
1、have的第三人称单数为has
故has to do为第三人称“它/他/她”的用词,其中包含短语“has to+动词原型”,意为“必须得去某事”；
故hasn't done=has not done是现在完成式has done的否定式,意为“到目前为止,还没有完成某事”.
2、have或has的过去式和过去分词为had
故hadn't done=had not done,是过去完成式had done的否定式,意为“过去没有做过某事”.
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