MODAL VERBS: Can , Must… (động từ khiếm khuyết)

a. Affermative form

     S + can / must + V +…..

b. Negative form

     S + can’t / mustn’t  + V……

c. Interrogative form

    Can + S + V ..?Yes, S + can  ./ No, S + can’t

* Can:    Chỉ khả năng . Có thể.               He can play soccer

               Chỉ sự cho phép. Có thể.           You can park here.

   -> Can’t:   Chỉ sự cấm . Không được.   You can’t turn left

* Must: diễn tả sự bắt buộc(an obligation) hay sự cần thiết (the necessity)

- Có tính cách cá nhân. I must do the exercises every day.

- Của chính sự kiện (có tính quy tắc). We must drive on the right.

- Có tính cách mệnh lệnh: You must do your homework.

* Must not=mustn’t: không được. Chỉ sự ngăn cấm (a prohibition).You mustn’t talk in class. -> Musn’t = can’t

* Needn’t : không phải, không cần: Phản nghĩa của  “must”

Must we …? No,You needn’t. He must come here tomorrow but I needn’t

-          Ss make sentences using those structures.

-          Ss do one by one or Teacher gives cues to Ss to make sentences.

Exercises

Ex1:  Make sentences using can or must

Eg: Ha / play games in the afternoon / do his homework in the evening.

Ha can play games in the afternoon, but he must do his homework in the evening

1. Loan / play badminton on Sundays/ do the housework first

2. Ba watch television in the evening / go to bed early.

3. Lan / go out  in the afternoon / do her homework in the evening.

4. They / go to school at 6.30 / have breakfast at six o’clock

5. He / go to work at 6 o’clock / get up at 5.30

Ex2:  Using can /can’t or must / mustn’t to rewrite these sentences.

1. He watches television .                

2. We do our homework                  

3. They don’t ride their motorbike.  

4. She doesn’t play video games.     

5. You don’t go ahead.

6. You turn right.

7. Do you swim?  

8. I don’t drive a car.

9. Birds fly in the sky.

10. DoesNamget up at 6.15 ?                         

Ex3:  Correct form of the verbs

1. He (can play) games.

2. They (can drive) a car/

3. We (must not park) here.

4. She (can work) at the factory?

5. I (can not do) this exercise.

Use What ..? to make question and answer.

1. Thu / read a book.                               

2. Lan and Ba / go to school.

3. Miss Hoa / walk to work                          

4. They / wait for a train.

5. They / travel to the park by taxi.             

6. Hao / have lunch.

7. They / have Geography lessons.      

8. Hoang / leave his house for school.

9. Quang / take the vegetables to the market.

10. The farmer / load the truck with vegetables.