【导语】英语语法让很多学生都头疼，因为复杂难懂的句式和词组有时难以记忆。英语网为大家整理了英语语法大全，希望对同学们的英语语法学习有所帮助。更多内容尽在英语网。
请先看一道题：
a. I __________ seen such a good harvest!
b. __________ I seen such a good harvest.
A. have never, Never have B. never have, Have never
C. have never, Have never D. never have, Never have
此题应选A。这里考查的是否定词置于句首，句子用部分倒装的问题。
一般说来，以下否定词位于句首，句子要用倒装(部分倒装-用一般问句的形式)：seldom, never, little, few, hardly, not, not until, in vain, in no way, by no means, on no account, no longer 等。如：
Never does he come late.
他从不迟到。
Little did he know that the police were after him.
他一点也不知道警察在找他。
By no means shall I go there again.
我决不会再去那儿了。
Hardly had he arrived at the station when the train began to leave.
他一到车站，火车就开动了。
Few students did they see in the classroom.
他们在教室没看到几个学生。
Not a word did I ever say to him.
我从未对他说过一句话。
Not until all the fish in the river died did the villagers realize how serious the pollution was.
直到河里的鱼全死了，村民们才意识到污染是多么严重。