大學英語四級考試涉及的語法知識點多、涉及麵寬，對不少考生來說都是一個難題。希望通過本文的學習，考生能對四級語法有更全麵的掌握!

　　部分倒裝的形式: 主謂賓保持原來的形式，謂語動詞的助動詞放到主語的前麵。

　　1、當句首狀語為否定詞或帶有否定意義的詞語時，這個句子就需要部分倒裝。

　　這類詞語有hardly, scarcely, rarely, seldom, never, few,little, less, at no time, by no means, in no case, under no circumstance, in no way,on no account, on no consideration, no longer, not only等。

　　eg. He never smokes. 他從來不抽煙。

　　Never does he smoke. eg. Not only did the customer complain about the food, he also refused to pay for it. 這位顧客不僅僅 抱怨食物不好，還拒絕付費。

　　eg. 在任何情況下我都不會相信你。Under no circumstance do I trust you.

　　2、當句首為only加狀語的時候，這個句子需要部分倒裝。

　　eg. Only with you can I feel happy. eg. 隻有當你來了這，我們才可以開始會議。

　　Only when you come, can we start the meeting.

　　3、so......that 結構中的so位於句首時，常引起部分倒裝。

　　eg. He runs so fast that I can't catch up with him. 他跑得實在是太快了，以致於我都沒有辦法追上他。

　　So fast does he run that I can't catch up with him.

　　eg. The moon was so bright that the flowers bright as by day. 皓月當空，花朵就像白天那樣的鮮豔。

　　So bright was the moon that the flowers bright as by day.

　　4、句子開頭的as 處在第二個單詞的位置上，表示雖然的意思。

　　eg. Although I am young, I can live by myself. 雖然我很小但是我卻能養活自己了。