2. 动词不定式的被动式在句中可以作主语（句1）、表语（句2）、宾语（句3）、________（句4）、状语（句5）、宾语补足语（句6）、主语补足语（句7）。

【自我归纳】to have been done；定语

【即学即练】

I. 用括号内动词的正确形式填空。

1. We're having a meeting this afternoon. The decision ________ (make) at the meeting will influence the future of our company.

2. Having a trip abroad is certainly good for the old couple, but it remains ________ (see) whether they will enjoy it.

3. My friend didn't want the subject ________ (mention) in the letter.

4. The machine doesn't work. It seems ________ (damage).

5. The news reporters hurried to the airport, only ________ (tell) the film star had left.

II. 用括号内动词的正确形式完成下面短文。

Although computer-like machines 1. ________ (build) in the 19th century, computers 2. ________ (sell) commercially for the first time in the 1950s, and a lot of progress 3. ________ (make) since then. Computers are now much smaller and more powerful, and they can 4. ________ (buy) much more cheaply.

Computers 5. ________ (use) in many fields - in business, science, medicine and education, for example. The computer's memory is the place where information 6. ________ (keep) and calculations 7. ________ (do).

Large numbers of home computers 8. ________ (sell) so far. People know more about computers than they used to, and computers are playing a bigger part in our lives.

Progress 9. ________ (make) all the time. Many people believe we can look forward to the day when even our household jobs

10. ________ (do) by computer-controlled robots.

答案

I. 1. to be made 2. to be seen 3. to be mentioned

4. to have been damaged 5. to be told

II. 1. were built 2. were sold 3. has been made