when引导的时间状语从句为什么从句主句都用一般现在时,或一般过去时.列;I get annoyed when my classmates borrow my eraser and don‘t return it.I saw a big black dog when i came in.

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when引导的时间状语从句为什么从句主句都用一般现在时,或一般过去时.列;I get annoyed when my classmates borrow my eraser and don‘t return it.I saw a big black dog when i came in.

when引导的时间状语从句为什么从句主句都用一般现在时,或一般过去时.列;I get annoyed when my classmates borrow my eraser and don‘t return it.I saw a big black dog when i came in.
when引导的时间状语从句为什么从句主句都用一般现在时,或一般过去时.
列;I get annoyed when my classmates borrow my eraser and don‘t return it.I saw a big black dog when i came in.

when引导的时间状语从句为什么从句主句都用一般现在时,或一般过去时.列;I get annoyed when my classmates borrow my eraser and don‘t return it.I saw a big black dog when i came in.
when引导的时间状语从句表示的是在某一时间截点时,宾语对主语的影响以及主语的动作和状态.以第一句为例:I get annoyed when my classmates borrow my eraser and don‘t return it 我同学借我的橡皮不还 这一点对主语产生了影响,所以when在这个时间上平衡前后两个时态