should have doneYou should have finished your homework before you play football with your classmates.为什么不用played?

来源：学生作业帮助网编辑：作业帮时间：2024/05/02 10:46:40

should have done
You should have finished your homework before you play football with your classmates.为什么不用played?

是你还没有去玩足球之前别人给你的警告.

should不是过去时态，是一般时态，所以play不用过去式

我觉得是原句错了，play应该用过去式的。这是虚拟语气，表示“你本应该做完作业再去和同学踢球的”，但实际上是没有完成作业就去踢球了。如果要表示命令的“你必须做完作业再去和同学踢球”，play 就不用加ed，但相应地前面也要改成you should finish your homework......

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我觉得是原句错了，play应该用过去式的。这是虚拟语气，表示“你本应该做完作业再去和同学踢球的”，但实际上是没有完成作业就去踢球了。如果要表示命令的“你必须做完作业再去和同学踢球”，play 就不用加ed，但相应地前面也要改成you should finish your homework...

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这里的should 表示虚拟语态，你还没和朋友出去玩啊，不能用过去式，这是对说话当时而言．那么再想你要和朋友玩了是不是表示你已经写完作业啦？所以是should have done
多看点虚拟语气的题吧

在你与你的同学出去踢足球之前你必需完成家庭作业
You should have finished your homework before you played football with your classmates. 虚拟语气

这是虚拟语态，在这句里表示是未来发生的事情，即你要在做完作业后才能去踢球。因此，根据从句“时态退一步”的原则，将来时退为一般时，因此用play是正确的。对于should have done的句型，你要记住这些要点。
另外一些虚拟语态，一般时退为过去时，过去时退为过去完成时，这方面的例子很多，多看看教课书吧，或是多问问老师。...

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finish是完成的意思吧。

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