14.notuntil I shouted at the top of my voice

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He didn't turn his head until I shouted at the top of my voice.
直到我用最大的嗓门喊他时他才回过头来.
原句是这样的.
这一句话是一句否定词开头的倒装句,一般用来表示强调.
主句就是全句的 至少是主语和谓语所在的地方,所以如果你对句子的结构熟悉的话你可以找主语谓语来确定主句.
但是更简单的方法是找引导词 which when where whose that if whether等等,跟在引导词后面的就是从句.
比如,你给出的例句它可以改写成: He turned his head when I shouted at the top of my vioce.
或者When I shouted at the top of my voice, he turned his head.意思不变.
这是一个when引导的时间状语从句,意思是when后面的从句在主句中充当状语的成分.
在这句中 主语是 He 谓语是turned,主句就是He turned his head ,
从句由when 引导,从句就是I shouted at the top of my vioce.
然后回到Not until i shouted at the top of my voice did he turn his head.这句话,
主句是 he turn his head,从句就是 i shouted at the top of my voice .
只不过这里是个倒装句型,要注意语法.
如果你难以判断这种类型的主句和从句,那就建议你先将它改写成when之类的引导词引导的正常语序的句子,然后再用'when'后面的就是从句,这样的法则就可以了.
知识拓展：部分倒装是指将谓语的一部分如助动词或情态倒装至主语之前.如果句中的谓语没有助动词或
情态动词,则需添加助动词do, does或did,并将其置于主语之前.
1、句首为否定或半否定的词语,如no, not, never, seldom, little, hardly, at no time,
in no way, not until… 等.
　　Never have I seen such a performance.
　　Nowhere will you find the answer to this question.
　　Not until the child fell asleep did the mother leave the room.
　当Not until引出主从复合句,主句倒装,从句不倒装.
注意：如否定词不在句首不倒装.
　　 I have never seen such a performance.
　　 The mother didn't leave the room until.
2、以否定词开头作部分倒装
如 Not only…but also, Hardly/Scarcely…when, No sooner… than
　 Not only did he refuse the gift, he also severely criticized the sender.
　 Hardly had she gone out when a student came to visit her.
　 No sooner had she gone out than a student came to visit her.
典型例题 No sooner___ than it began to rain heavily.
A. the game began　　　　　 B.　has the game begun
C. did the game begin　　　 D.　had the game begun
答案D. 以具有否定意义的副词放在句首时,一般采用倒装句(谓语前置).这类表示否定意义
的词有never, seldom, scarcely, little, few, not, hardly, 以及not only…but
(also), no sooner…than, hardly… when scarcely… when　等等.
注意：只有当Not only… but also连接两个分句时,才在第一个分句用倒装结构.如果置于句
首的Not only… but also仅连接两个并列词语,不可用倒装结构.
Not only you but also I am fond of