我们都知道，在大学英语四级考试中，单独考察英语四级语法的题型很少，但是英语四级语法知识点却贯穿整张试卷，下面是新东方网英语四级频道为大家整理的大学英语四级语法知识，希望可以为大家带来帮助。

　　2017年12月大学英语四级语法大全目录

　　20.5 表原因关系

　　1) for

　　判断改错：

　　(错) For he is ill, he is absent today.

　　(对) He is absent today, for he is ill.

　　for是并列连词，不能置于含两个并列分句的句子的句首，只能将其放在两个分句中间。

　　2) so, therefore

　　He hurt his leg, so he couldn't play in the game.

　　注意：

　　a. 两个并列连词不能连用，但therefore, then, yet.可以和并列连词连用。

　　You can watch TV, and or you can go to bed.

　　He hurt his leg, and so / and therefore he couldn't play in the game.

　　b. although… yet…，但although不与 but连用。

　　(错)　Although he was weak, but he tried his best to do the work..

　　(对)　Although he was weak, yet he tried his best to do the work.

　　2017年12月大学英语四级语法大全目录

英语四级必备工具：测测你的词汇量能过四级吗