*Cấu trúc câu với các động từ khiếm khuyết modal verbs(can, could, must, have to, need to, ought to, should, ....):

(+) S + modal verbs + V(inf)

(-): Trường hợp 1: S + modal verbs (trừ những động từ có chữ to ở cuối như have to, need to, ought to, ...) + not + V(inf)

     Trường hợp 2: S + modal verbs (những động từ có chữ to ở cuối như have to, need to, ought to, ... nhưng lược bỏ to) + not + to + V(inf)

(?) Modal verbs + (not) + S + V(inf)?*

                                                           BÀI LÀM:

$1$, 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"

→ Đổi câu gián tiếp sang câu trực tiếp thì chuyển tân ngữ his thành your, 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