1. the report. Remind them of the different tenses of passive voice.

Answers

(1) are being (2) Electric Wear (3) been developed (4) teenagers (5) was invented

(6) are used (7) been completed (8) will be produced (9) will be (10) was announced (11) was shown (12) are cleaned

【设计说明】通过实例复习被动语态，把学生自主学习和教师指导相结合，以练习促进理解。

Step 3 Modal verbs and the passive voice

1. Ask students how to form the passive voice with modal verbs. Ask them to read the example sentences in Part 2 and show them the pattern:

　　Modal verb + be + done（PPT page 16）

2. Ask students to do the following practice to understand the pattern better.

　　Change the following sentences into the passive voice:

(1) The viewer can touch the objects in the film.

(2) The viewer may feel a real sense of achievement and happiness.

(3) RealCine might not impress some viewers.

(4) Teachers could use RealCine in the classroom too.

(5) Film-makers should use RealCine for all films.

(6) Scientists ought to develop RealCine further.

(7) The viewer must wear special gloves.

Answers

(1) The objects in the film can be touched.

(2) A real sense of achievement and happiness may be felt.

(3) Some viewers might not be impressed by RealCine.

(4) RealCine could be used in the classroom too.

(5) RealCine should be used for all films.

(6) RealCine ought to be developed further.

(7) Special gloves must be worn.

3. Ask students to read the first report in the exercise. Then ask them to complete the second report by referring to the information in the first one.

Answers

(1) can be reduced (2) must be taken (3) should be made (4) must be worn

(5) may become (6) ought to be reduced (7) might be cured

【设计说明】本部分旨在帮助学生理解情态动词用于被动语态时的基本形式，在帮助学生归纳出基本形式之后，用练习帮助学生巩固所学知识。

Step 4 Verbs often used in the passive voice

Ask students to read the instructions of the exercise on page 51 and the timeline. Then they should complete the article with suitable verbs in their proper forms.

　　Answers

(2) bored with (3) interested in (4) was written by (5) was set up (6) were employed (7) was surprised at (8) was accused of (9) was questioned by (10) was closed down (11) was purchased