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高中英语语法教案

高中英语语法教案

Teaching Goals:

1. To enable Ss to know about the way to express possibility and improbability.

2. To enable Ss to master the usage of “may”, “might”, and “likely”.

3. To help Ss learn how to use modal verbs “may” and “might” to express conjecture. Teaching Procedures:

Step 1. Revision

Check the answers to the Vocabulary exercises in the Workbook.

Step 2. Function

1. Ask Ss to do Activity 1 on page 54 and call back the answers. Then give them the correct answers.

2. Ask Ss to identify the creatures in the pictures in Activity 4 on page 55, by using “may” or “might”. Arouse their interest in talking about possibility.

3. Ask Ss to do Activity 2 on page 54 individually. Then check their answers.

Step 3. Grammar

1. Leading-in

Ask Ss to work in groups and discuss the question in Activity 1 of Grammar on page 57. Then give them the right answer.

2. Explanation

Explain how to use modal verbs to talk about something which happened in the past—perhaps.

(1) 对过去的事情进行猜测,但把握较小时,肯定形式一般用may have done,否定形式一般用may not have done。如:

He may have gone back home, because he didn’t say he would take part in her birthday party. He may not have paid for the bill, because he had lost his job.

(2) 对过去的事情进行猜测,但把握更小时,肯定形式一般用might have done,否定形式用might not have done。如:

They helped send her bat to the hospital; otherwise, she thought, the baby might have died. She might not have left home when I got to school.

(3) 对过去的事情进行猜测,并且可能性较大时,肯定形式一般用must have done,否定形式一般用can’t have done。如:

Your score is the highest; you must have studied very hard.

You can’t have seen her in her office last Friday; she’s been out of town for two weeks.

3. Practice

Ask Ss to do Activity 2 on page 57. Then call back the answers and correct them.

4. Supplements

Explain how to use modal verbs to talk about something which happened at present—perhaps. 用来表猜测的情态动词有:must, can, may等,但它们所表示可能性是不同的。

(1) 对现在的事情进行猜测,并且可能性较大时,肯定形式一般用must加动词原形,此时,must不再表示“必须”,而是表示“肯定”;否定形式一般用can’t加动词原形,此时,can不再表示“能够”,而是表示“肯定不 ”。如:

I saw him go out just now. He can’t be in his own room.

It must be Linda in the classroom, because she is on duty today.

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