不完全倒装句型要求当某一特定内容出现在句首时，不能将谓语动词直接置于句首，而须在该特定内容后加上助动词。不完全倒装句型的构成常有下列标志：
1.Often, many a time, never, seldom等表示频度的副词置于句首时，应使用完全倒装句型。
例如： Seldom does he go home. Many a time has he been to Beijing.
2.Hardly, scarcely, barely, little等主要表示否定意义的副词出现在句首时应使用不完全倒装句型。例如： Hardly can you understand the text.
Little does he know about the news.
3.Not until + 时间出现在句首时应使用不完全倒装句型。例如：
Not until the early years of the 19th century did man know what wheat is.
Not until I began to work did I realize how much time I had wasted.
Not until all the fish died in the river did the villagers realize how serious the pollution was.
4.Hardly\\\when\\\, no sooner\\\\ than\\\\(一、、、就、、、)置于句首时使用不完全倒装句型。例如：
Hardly had I got to the airport when the plane took off.
No sooner had he gone to bed than the telephone rang.
5.表示“也”的so(用于肯定句)和neither/nor(用于否定句)出现在句首时应使用不完全倒装句型。例如：
he has passed the exam, so have i.
Do you know Jim quarrelled with his borther?I don’t know, nor do I care.
6.Only 出现在句首修饰介词短语、副词、时间状语从句和原因状语从句时，就使用不完全倒装句型。例如：
Only in this way can you work out this question.
Only when he is free does he come to see me.
Only because he was busy did he not go there.
Only修饰主语时不能使用倒装句型。
Only teachers can use this room.
7.Not only…but also….结构中的not only置于句首且not only和but also后均不直接跟主语时，应使用不完全倒装句型。例如：
Not only does he study English but also French.
注意：not only….but also…连接两个分句的第一个分句倒装，第二个分句不倒装。例如：
not only does he study hard but also he has a kind heart.
Not only…but also….连接两个主语时不倒装。例如：
Not only he but also his parents have been to Beijing.
8.当so… that…（如此、、、以致、、、，引导结果状语从句）结构中的so出现在句首时应使用不完全倒装句型。例如：
so fast did he run that I couldn’t catch up with him.
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