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问题: 时态

I knew Mary played the piano,but I didn't know she played teh guitar.

这里的 played 不是应该用原型 play 吧,前面用了过去式--knew 和 didn't

解答:

这是宾语从句,从句的时态根据主句而定的,主句用一般过去时,从句也使用相应的过去时态,此处也为一般过去时。另I knew 后省略了that。