【归纳拓展】

(1)被强调的部分指人时，用who或that皆可，被强调的代词的格应与原句的格保持一致。被强调的部分如果是原句的主语，who或that后面的谓语动词在人称和数上应和原句的主语保持一致。被强调的部分是时间或地点状语时，不能用when或where而用that。

(2)辨别强调句型的方法是：若原句去掉it is/was及that仍然成立，则是强调句，否则就不是。而强调谓语动词时，要用do，does或did。

☛What is it that he wants to do?他究竟想干什么？

☛It was not until yesterday that I finished the work.直到昨天我才完成工作。

☛He did come here yesterday.昨天他的确来过。

【跟踪典例】

(1)单句改错

①It is you who is right.________

②It was along the Mississippi River where Mark Twain spent much of his childhood.________

(2)用强调句型改写句子

①My mother often tells me to be careful.

→________________________________________________________________________

②I didn't go to bed until twelve o'clock last night.

→________________________________________________________________________

【答案】(1)①第二个is→are　 ②where→that

(2)①It is my mother who/that often tells me to be careful

②It was not until twelve o'clock that I went to bed.

3．There is no doubt that John's quick thinking and the first aid skills he learned at school saved Ms Slade's

life.毫无疑问，是约翰敏捷的思维和在学校学到的急救技术使得斯莱德女士得救了。

（1）句中that至句末是同位语从句，作doubt的同位语；he learned at school是定语从句，修饰先行词the first aid skills，关系代词that因在定语从句中作learned的宾语而被省去。

（2）There is no doubt that...是固定句型，意思是"毫无疑问/肯定......"。

☛There is no doubt that they will come to help us.

毫无疑问他们会来帮助我们的。

☛There is no doubt that he is an honest man.

毫无疑问他是一个诚实的人。

【归纳拓展】

（1）当doubt为名词时，在否定句或疑问句中，其后面接that引导的同位语从句；若用在肯定句中，后接whether引导的同位语从句，注意此时不可以用if替换whether。

（2）当其为动词时，若用在否定句或疑问句中，后面接that引导的宾语从句；若用在肯定句中，后接whether或if引导的宾语从句。

（3）in doubt怀疑，拿不定主意

no/without/beyond/out of doubt无疑地，必定，毫无疑问