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when从句的主句为何用目前完成时态

来源:www.bcgln.com 2025-05-20

When they get to school age they have not learned any self control.

对when引导的时间状语从句时态有点乱,请问这句是为了表达“还没掌握自我管理”的意思才用have done吗?

强调主句动作发生在从句动作之前,故用目前完成时。

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