$\text{Cấu trúc câu với các động từ khiếm khuyết (modal verbs) :}$

$\rightarrow$ (+) S + modal verbs + V_inf

$\rightarrow$ (-) :

$\rightarrow$ Trường hợp 1: S + modal verbs (trừ những động từ có chữ to) + not + V_inf + O.

$\rightarrow$ Trường hợp 2: S + modal verbs (những động từ có chữ to ở cuối nhưng lược bỏ to) + not + to + V_inf + O.

$\rightarrow$ (?) Modal verbs + S + V_inf + O ?

$\text{Ex 4 :}$

1. Passenger must not use cell phones on Tokyo subway.

2. Children need to do physical activities.

3. Jenny said to Timmy: "You should leave your home at 12:30 pm to catch the 1:00 pm train."

$\rightarrow$ Đổi câu gián tiếp sang câu trực tiếp

$\rightarrow$ Chuyển tân ngữ his thành your

$\rightarrow$ Chuyển chủ ngữ Timmy thành he

4. Parents ought to communicate with their children on any topic in order to improve their family relationship.

5. I must be a the station 30 minutes before the coach to Vung Tau leaves.

6. A mother should talk to her baby as soon as he or she is born.

7. Teenagers should hang out with friends besides studying.

8. Michelle ought to keep a journal on her daily activities.

9. Children under 12 must be accompanied by an adult to the entertainment centre.

10. You should tell your parents before they ask you.

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