英語的正常語序是-主語+助動詞/動詞。
倒裝一般將助動詞/動詞放在主語的前面。
1.最常見的倒裝句型就是疑問句，比如
原句是 ： You are tired.? 疑問? Are you tired ?
2. 在有些情況下，我們會在非疑問句里運用倒裝結構，達到強調等目的。
2.1 當否定的詞在句首的時候， 往往用倒裝結構。
比如 Hardly ,? Never,? Seldom , Rarely , Only then, Not only .. but , Not sooner
Scarecely , Only later, Nowwhere ,Little , Only in this way, in no way , on no account.
例句： Hardly have i seen a sunny day in last month.???????????? Seldom do we meet each other after graduation.
???????????? Noon sooner had i drove away than the police gave ticket for illegal parking.
??????????? Nowwhere could i found the PSP.
??????????? Only in this way could you get long-lasting happniness.
???????????? In no way do i agree with what you are saying.
???????????? On no account should vendor switch material without our consent.
??? 2.2 當以下詞組在句首的的時候， 從句用倒裝結構
Not until,? Not since, only after, only when, only by
例句：Only by working extremely hard could we afford a house.
?? 2.3? 可以用倒裝來替代 If條件從句里的"If"
正常語序：? If i had checked careflly , this problem wouldn't have happened.
倒裝語序：? Had i checked carefully ,?? this problem wouldn't have happened.
正常語序： I we had discovered it sooner , we could have prevented the tragedy!
?倒裝語序： Had we discovered it sonner , we could have prevented the tragedy!
2.4 當狀語在句首的時候， 要將助動詞/動詞提到主語的前面
正常語序： All the money we had lost was on the table.
? 倒裝語序： On the table was all the money we had lost .
正常語序： The knights came around the corner.
倒裝語序： Round the corner came the knights.
2.5 當句子以 SO+形容詞開頭的時候，可以用倒裝
正常語序： The girl was so beautiful that nobody could talk of anything else.
倒裝語序： So beautiful was the girl that nobody could talk of antying else .
???????????????
2.6 There開頭的句子可以倒裝
正常語序： A lake lies near our village.
倒裝語序：? There lies a lake near our village.
正常語序：A great thicker named Aristotle lived in greece.
倒裝語序：There lived in greece a great thicker named Aristotle.
2.7 當"Only +狀語“在句首標示強調的時候，要用倒裝
正常語序： I only finished the book yesterday.
倒裝語序： Ony yesterday did i finish the book.
2.8 當Often , always , once, many a time , now and then , everyday 等表示頻度的副詞及短語放在句首的時候，要倒裝
正常語序： We often warn them not t odo so.
倒裝語序： Often do we warn them not to do so.
2.9 由 As, however 引導的讓步狀語從句，可以倒裝
正常語序：I will not buy it though i like it .
倒裝語序： Much as i like it , i will not buy it.
正常語序： He continued the work despite he was tired.
倒裝語序： Tried as he was , he continued the work
