两句英语句子的区别I have to finish the work at FridayI have to finish

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/16 00:41:28

两句英语句子的区别
I have to finish the work at Friday
I have to finish the work by Friday
两句句子有什么区别?
by+时间,by+时间点,表示的是什么?

第一句话……我必须‘在周五这天’做完工作.很少这么说啊,意思是之前都不能做,只能周五这天做,还必须做完.一般这种在当天做完的工作都是指‘今天’吧：I have to finish the work today.
第二句话更make sense,我必须在周五前做完工作.by+时间点表示截止到某个时间,可以是说之前的事情也可以说之后将要发生的事情.
再问： ‘I have to finish the work by Friday’，周五之前完成，可以理解，之后还能发生什么事情？还有‘I have to finish the work today’中，today前的at怎么省略了？这是为什么？
再答： today之前不加介词，就和here之前不加in一个道理。i'm here. ‘之后还可能发生什么事情。’？什么意思
再问：还有什么之前不加介词?怎么判断？
再答：你一时要我说我也想不起来啊，- -，这种东西，死记+语感，用的多了就知道了。

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