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20.No sound and no voice are heard.are--is.

分析 没有任何声音被听到.

解答 答案:are--is.
考查主谓语的一致性.No-and no----指同一概念,作主语时用单数,且与hear为被动关系,所以谓语用is  heard.

点评 考查汉译英.
在英语的句子中,谓语要在人称和数上与主语保持一致,主语和谓语一致的三条原则:形式一致原则、就近一致原则和意义一致原则.
1.形式一致原则,就是根据主语的单复数来决定谓语的单复数,根据主语的人称来决定谓语的形式,
She has (got) a color TV set and we have (got) a black-and-white TV set.她有一部彩色电视机,我们有一部黑白电视机.
2.就近一致原则是指:在一个句子中,如果有两个主语,谓语动词只跟相邻的一个主语在人称和数上保持一致.这种情况只要记住常见的几种情况(如:or,either…or,neither…nor,not only…nut also…,not…but…,there be…etc.)就行了.例如:
Are you or I to go and deal with the problem?你去还是我去处理那个问题?
3.意义一致原则是在英语中,有些名词作主语时,要根据具体语境中该名词的意义来确定其谓语的单复数.常见的有下列几种情况:
The old are easy to catch cold in winter.老年人冬天容易感冒.
Nine plus nine is eighteen.

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