i knew the robots could play chess with us变疑问句否定句呢,为什么could不变成can

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iknewtherobotscouldplaychesswithus变疑问句否定句呢,为什么could不变成caniknewtherobotscouldplaychesswithus变疑问句否定句呢,

i knew the robots could play chess with us变疑问句否定句呢,为什么could不变成can
i knew the robots could play chess with us变疑问句
否定句呢,为什么could不变成can

i knew the robots could play chess with us变疑问句否定句呢,为什么could不变成can
I knew the robots could play chess with us.变疑问句
Did you know the robots could play chess with us?
你知道机器人能和我们下棋吗?
否定句:I didn't know the robots could play chess with us.
变否定句,加了助动词did后,knew由过去式变回原形.而宾语从句中的could仍然要与主句的时态保持一致,并不因为加了did,就改成can.

Did you know the robots could play chess with you ?
否定句: I didn't know the robots could play chess with us .
因为主句是一般过去时,故从句要用相应的过去时,即could 不用改变
加油!不明白再问!如果帮到你,请采纳,谢谢!否定句呢,为什么could不变成can否定句...

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Did you know the robots could play chess with you ?
否定句: I didn't know the robots could play chess with us .
因为主句是一般过去时,故从句要用相应的过去时,即could 不用改变
加油!不明白再问!如果帮到你,请采纳,谢谢!

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