When和while引导的从句的时态根据具体情况而定,可以是任何时态,包括一般现在时、进行时、一般过去时、过去进行时、将来时等。主句的时态通常取决于从句所使用的时态,以使句子的时态逻辑得以保持连贯。例如:
- When he arrived, she was reading a book.(从句用过去进行时,主句用过去时)
- While I am cooking dinner, my kids are doing their homework.(从句用现在进行时,主句也用现在进行时)
- When we go to Paris next month, we plan to visit the Eiffel Tower.(从句用一般将来时,主句也用一般将来时)
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