老师说我们必须周五前交作业。

老师说我们必须周五前交作业。

The teacher said that we had to hand in our homework by Friday.

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The teacher said that we had to hand in our homework by Friday.

said 是 say 的过去式,that 引导 that-从句。从句中 you→we + your→our 体现人称和物主代词的双重转换。

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