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#英语易错知识点#
一、在even if, even though 所引导的让步状语从句中，可用虚拟语气，主句、从句的结构与if所引导的条件从句结构相同。
Even if he were here himself, he should not know what to do.
即使他亲自来也不知该怎么办。
Nobody could save him even though Hua Tuo should come here.
即使华佗在世也救不了他。
二、在whatever， whichever，whenever，whoever, wherever，however, no matter wh-word 等引导的让步状语从句中，从句虚拟语气结构为：
① may +动词原形(指现在或将来)。
We will finish it on time no matter what / whatever may happen.
不管发生什么事，我们都要按时完成。
We will find him wherever / no matter where he may be.
无论他在哪里，我们都要找到他。
I will wait for him no matter how late he may come.
不管他来得多么晚，我都会等他。
② may +完成时(指过去) ，主句结构不限。
You mustn"t be proud whatever / no matter what great progress you may have made.
不管你取得了多么大的进步，你也不能骄傲。
We must respect him no matter what / whatever mistakes he may have made.
不管他翻过什么错误，我们必须尊敬他。
三、在though, although等引导的让步状语从句中，从句虚拟语气结构为 should +动词原形，主句结构不限。
Although / Though he should often be late, he is a good student.
尽管他经常迟到，他还是个好学生。
Although / Though he should be secretary, he must obey the rules.
尽管他是书记，他也必须遵守规定。
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