如：I am your best friend.
It is I that/who am your best friend. （强调主语）
如：I met Tom yesterday by chance.
It was I that/who met Tom yesterday by chance.
It was Tom that/whom/who I met yesterday by chance.
It was yesterday that I met Tom by chance.（强调时间状语）
It was by chance that I met Tom yesterday.（强调方式状语）
强调句的特征：去掉“It is/was …that….”三部分后，句子依然完整。否则不是强调句。
如：It was six when Tom came back yesterday.
It was at six that Tom came back yesterday.
如：I do want to change this situation, but I don’t know how to do it.
He did visit Professor Li yesterday.
If you have a job, A yourself to it and finally you’ll succeed.
A. do devote B. don’t devote C. devoting D. not devoting (四川)
如：He didn’t understand the problem until I explained it three times.
It was not until I explained it three times that he understood the problem.
----Where did you first met Tom?
----It was in the hotel ______ he lived.
答语后面省略了强调句的后半部分。完整的说法应是：It was in the hotel where he lived (that I first met Tom).
1. It was from only a few supplies that she had bought in the village ____ the hostess cooked such a nice dinner.
A. where B. that C. when D. which （安徽）
2. John’s success has nothing to do with good luck. It is years of hard work ____ has made him what he is today.
A. why B. when C. which D. that (湖南)
3. It’s not what we do once in a while ____ shapes our lives, but what we do consistently.
A. which B. that C. how D. when (湖南)
4. It’s not how much we do but how much love we put into what we do ____ benefits our work most.
A. who B. which C. that D. what （陕西）
5. ----Have you seen the film Under the Hawthorn Tree?
----Of course, I have. It was in our village ____ it was made.
A. that B. where C. when D. which (重庆)
6. Was it on a lonely island ____ he was saved one month after the boat went down?
A. where B. that C. which D. what (四川)
7. It was not until I came here ____ I realized this place was famous for not only its beauty but also its weather.
A. who B. that C. where D. before (湖南)
8. It was only after he had read the papers Mr. Gross realized the task before him was extremely difficult to complete.
A. when B. that C. which D. what (课标2)
9. It was with the help of the local guide ______ the mountain climber was rescued.
A. who B. that C. when D. how (重庆)
10. It was the middle of the night __ my father woke me up and told me to watch the football game.
A. that B. as C. which D. when （江西）
练习答案：1. B 2. D 3. B 4. C 5. A 6. B 7. B 8. B 9. B 10. D