but still we weren‘t no sure we could beat them这句为什么用过去式?were,could?

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butstillweweren‘tnosurewecouldbeatthem这句为什么用过去式?were,could?butstillweweren‘tnosurewecouldbeatthem这句为

but still we weren‘t no sure we could beat them这句为什么用过去式?were,could?
but still we weren‘t no sure we could beat them这句为什么用过去式?were,could?

but still we weren‘t no sure we could beat them这句为什么用过去式?were,could?
这句话肯定是说话人赢了别人(打败别人)时说的,所以主句用了过去式,当然从句里的情态动词也用过去式,叫做时态的一致.又如:
He said he was sorry.
He said that I hadn't changed much.
She said he was waiting.
She said he had been waiting.
He said that the man had come at six.
He said that it had been raining the day before.
She said he would come late.
He said that he would have finished reading the book by the end of that week.
He said that he would be seeing me off on the ten o'clock train.
She said that he could swim very well.
但是如果从句说的是客观真理,时态可以保持不变,如:
The teacher told us that the earth moves around the sun.
The teacher said that water freezes at thirty-two degrees Fahrenheit.
希望我能帮助你解疑释惑.