強調句通常用的句式：it is + 被強調的部分 + that + 句子的其余成分。強調部分指人的時候，用who 或者that; 指物的時候用that。
例1：
It is from the sun that we get light and heat.
被強調的部分（物）
例2：
It was Sam who knocked down that old man and fled.
被強調的部分（人）
注意：如何判斷強調句式？
把一個句子中的it is …that/who這個部分去掉，如果剩余的句子仍然是完整的，那么這個句式就是一個強調句。反之則有可能是其他從句。
例如：
It is exciting that we succeeded in launching the satellite.
這個句子雖然也有it is ….that 的結構，但只要把這個結構去掉，就可以發現：剩下的內容不能構成完整的句子。所以這不是一個強調句。在這里It is…that 是不能隨便去掉的，因為這里it 是形式主語。
翻譯示例：
例：______________ （直到他詳細研究）that the first of the vitamins was identified.
1. 所譯部分為句子的主干，需要強調句型，表達方式為it is not until...that
2. 從句為過去時，所以主句中也應該是過去時
3. “詳細地”表達方式應該是in detail。
答案：It was not until he investigated in detail
實戰演練：
1. It was not until 1920 __________ regular radio broadcasts began.
A. while B. which C. that D. since
2. She said she would go and she __________ go.
A. didn’t B. did C. really D. would
3. Why was __________ that the old woman was sent to prison?
A. he B. it C. when D. what
4. It is __________ any wonder that his friend doesn’t like watching television much.
A. no B. such C. nearly D. hardly
5. It was the boy__________ had been in prison __________ stole the money.
A. who, where B. that, how C. who, that D. that, which
6. It was the training __________ he had as a young man __________ made him such a good engineer.
A. what; that B. that; what C. that; which D. which; that
7. —Were all three people in the car injured in the accident?
—No, __________ only the two passengers who got hurt.
A. there were B. it had C. there had D. it was
8. __________ in 1943__________ the harmful smog made its appearance in Los Angeles.
A. Only… that B. It was… then C. That it was… when D. It was… that
9. __________ the 1500’s __________ the first European explored the coast of California.
A. It was until……then B. It was not until …when
C. It is until……that D. It was not until……that
10. It was only with the help of the local guide __________.
A. was the mountain climber rescued B. that the mountain climber was rescued
C. when the mountain climber was rescued D. then the mountain climber was rescued
答案及解析：
1. C 2. B 3. B 4. D 5. C 6. A 7. D 8. D 9. D 10. B
1. 本題考查的是強調句式。強調句式由“it is/was + 被強調成分+that/who…”構成。此題強調的是時間。
2. 在謂語動詞前加do表示對動作的強調。and連接兩個并列謂語，其形式應一致，故用過去時態。
3. 此題考查的是強調句的特殊疑問句形式。it在此作為形式主語，真正的主語是that從句。
4. 此句是一個強調句。根據題意“他的朋友不怎么喜歡看電視”可知這并沒有什么可奇怪的，故排除B和C。no后直接加名詞相當于not any +名詞，可排除A。故選D。
5. 此題考查的強調句中含有一個定語從句。Who引導的定語從句修飾被強調部分the boy，that引導的從句構成強調句中的真正的主語。當被強調部分是人時，可以用that和who來引導從句。
6. 此題考查的強調句型中包含一個定語從句。What引導的定語從句，修飾被強調部分the training，that從句構成強調句中的真正主語。
7. 本題考查的是強調句式。強調句式由“it was + 被強調成分+ who…”構成。
8. 本題考查的是強調句式。強調句式由“it was + 被強調成分+that…”構成。本句強調的是時間。
9. 本題考查的是強調句式。強調句式由“it was + 被強調成分+that…”構成。本句強調的是時間。not until…意為“直到……才”。
10. 本題考查的是強調句式。強調句式由“it was + 被強調成分+that…”構成。從句的語序仍然用陳述語序。
