1. 强调句型： It is /was + 被强调部分 + that/who + 照抄 I saw a mad dog in the street yesterday morning. 主 谓 宾地点状语时间状语 It was I who/that saw a mad dog in the street yesterday morning. It was a mad dog that I saw in the street yesterday morning. It was in the street that I saw a mad dog yesterday morning. It was yesterday that I saw a mad dog in the street.

2. 1. 强调人时，可用 who / that 强调其他，则只能用 that 2. 此结构不能强调谓语动词 那么谓语动词怎么强调呢？ I believe you. I do believe you. He told me the truth. Note: He did tell me the truth. Tom always tells lies. Tom does always tell lies.

3. 1. It is the children that/who often help their parents do the farm work. 2. It was in 1993 that a tomato was developed that was very different from any grown before. 3. It is the shortage of arable land that is the biggest problem for Chinese farmers. 4. It is the plants grown in the greenhouses that are protected from the wind, rain and insects. 5. It is high technology as well as traditional methods that future agriculture should depend on.

4. 1.Henry gave George a new tie for his birthday last year. 主 间宾 直宾目的状语 时间状语 It was Henry who/that gave George a new tie for his birthday last year. It was to George that Henry gave a new tie for his birthday last year. It was a new tie that Henry gave George for his birthday last year. It was for George’s birthday that Henry gave him a new tie last year.

5. It was last year that Henry gave George a new tie for his birthday. 2. During that period of time they made three important discoveries. 时间状语主语 宾 语 3. Some people in South America still practise this kind of farming. 主语 定 语 宾 语