1,主句过去式，从句要用过去相应时态
2，watch,see ,hear 等后接动词原型，见证动作全过程，接动词ing动作正在发生
3，be动词+动词ING
4，请求或建议对方，希望对方做肯定回答
the old man said he rang the bell for the boy.
8个回答
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