【句子】

Scientists do not know why dinosaurs became extinct, but some theories postulate that changers in geography, climate, and sea levels were responsible.
科學(xué)家不知道恐龍為何絕種了，但是一些理論推斷是地理，氣候和海平面的變化造成的。?

【解析】

1.強(qiáng)調(diào)句句型講解

1) 陳述句的強(qiáng)調(diào)句型

It is/ was + 被強(qiáng)調(diào)部分(通常是主語、賓語或狀語)+ that/ who(當(dāng)強(qiáng)調(diào)主語且主語指人)+ 其他部分。

It was yesterday that he met Li Ping.

2)一般疑問句的強(qiáng)調(diào)句型

同上，只是把is/ was提到it前面

Was it yesterday that he met Li Ping?

3)特殊疑問句的強(qiáng)調(diào)句型

被強(qiáng)調(diào)部分(通常是疑問代詞或疑問副詞)+ is/ was + it + that/ who + 其他部分

When and where was it that you were born?

4) not … until … 句型的強(qiáng)調(diào)句

A. 句型為：It is/ was not until + 被強(qiáng)調(diào)部分 + that + 其他部分

普通句：He didn't go to bed until/ till his wife came back.
強(qiáng)調(diào)句：It was not until his wife came back that he went to bed.

B. 注意：

此句型只用until，不用till。但如果不是強(qiáng)調(diào)句型，till, until可通用;因?yàn)榫湫椭蠭t is/ was not ... 已經(jīng)是否定句了，that后面的從句要用肯定句，切勿再用否定句了。

5) 謂語動(dòng)詞的強(qiáng)調(diào)

A. It is/ was ... that ... 結(jié)構(gòu)不能強(qiáng)調(diào)謂語，如果需要強(qiáng)調(diào)謂語時(shí)，用助動(dòng)詞do/ does或did
Do sit down. 務(wù)必請(qǐng)坐。
Do be careful when you cross the street. 過馬路時(shí)，務(wù)必(千萬)要小心啊!

B. 注意：
此種強(qiáng)調(diào)只用do/ does和did，沒有別的形式;過去時(shí)用did，后面的謂語動(dòng)詞用原形。

2.強(qiáng)調(diào)句的十種結(jié)構(gòu)

1)用助動(dòng)詞“do(does/did)+動(dòng)詞原形”來表示強(qiáng)調(diào)

Do write to me when you get there.
你到那兒后務(wù)必給我來信。

2)用形容詞very，only，single，such等修飾名詞或形容詞來加強(qiáng)語氣

How dare you buy such expensive jewels?
你怎么敢買這么貴的寶石呢?

3)用ever，never，very，just等副詞和badly，highly，really等帶有-l y的副詞來進(jìn)行強(qiáng)調(diào)

I really don’t know what to do next.
我的確不知道下一步該怎么做。

4)用in the world，on earth，at all等介詞短語可以表達(dá)更強(qiáng)的語氣(常用于疑問句)

Where in the world could he be?
他到底會(huì)在哪兒?

5)用感嘆句來表示強(qiáng)烈的感情，突出說話人的情感

How interesting a story it is!
這是一個(gè)多么有趣的故事啊!

6)用重復(fù)來表示強(qiáng)調(diào)

Why!why!The cage is empty!
啊!啊!箱子是空的。

7)用倒裝句(也就是將要強(qiáng)調(diào)的句子或被強(qiáng)調(diào)的部分置于句首)來加強(qiáng)語氣

On the table were some flowers.桌上擺著一些花。(強(qiáng)調(diào)地點(diǎn))

8)用強(qiáng)調(diào)句型：“It is(was)+被強(qiáng)調(diào)的部分+that(who)+原句其它部分”來強(qiáng)調(diào)說話人的意愿

It was on Monday night that all this happened.
所有這一切發(fā)生在周一晚上。

9)用If來表示強(qiáng)調(diào)

If anyone knew the truth，it was Tom.
如果說誰了解事實(shí)的真相，那便是湯姆。

10)用破折號(hào)、黑體字也可以表示強(qiáng)調(diào)，加強(qiáng)語氣

It’s because of hard work—ten years of hard work.
那是因?yàn)槠D苦的工作--十年艱苦的工作!

【注意】
that后的強(qiáng)調(diào)句如果是原因狀語從句，從句只能用because引導(dǎo)，不能用since，as或why。

It was because the water had risen that they could not cross the river。

3.postulate

1)n.假定；基本條件

Authority is a postulate of the moral order and derives from God.
權(quán)威是一種道德秩序的主張，并且它來源于上帝。

2)vt.要求；假定

The school building programme postulates an increase in educational investment.
修建校舍的規(guī)劃是在增加教育經(jīng)費(fèi)的前提下擬定的。?

【練習(xí)】

____ that caused him to serve dinner an hour later than usual.（典型高考陷阱題）
A. It was we being late
B. It was our being late
C. It was we were too late
D. It was because we were late

>>典型高考英語陷阱題詳解?強(qiáng)調(diào)句
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