zzzi
花朵
共回答了24个问题采纳率:91.7% 举报
不可以.
When引导的是一整个从句:reports came into London Zoo that a wild puma had been spotted forty-five miles south of London
that引导的是When从句中的一个从句: a wild puma had been spotted forty-five miles south of London,用来修饰reports.显然,puma被spot的动作发生在reports came之前,所以要用一个比reports came更早的时态,也就是过去完成时.
1年前
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wlint
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It's OK,Susan.we had this part of the conversation before Michelle and her friends arri 这个一个前一个后 为什么就用一般过去式你怎么解释呢
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zzzi
主句是we had this part of the conversation。如果不考虑虚拟语气,主句一般只用四种时态:一般过去,一般现在,现在完成,一般将来。主从有别,主句不用跟随从句变化,但从句时态要跟随主句变化。