I.

1. has worked

since -> dấu hiệu thì hiện tại hoàn thành.

2. didn't take

last + time -> dấu hiệu thì quá khứ đơn.

3. has gone

Tạm dịch : Bọn cướp đã chạy đi trước khi cảnh sát đến.

4. received

time + ago -> dấu hiệu thì quá khứ đơn.

5. gets

always -> dấu hiệu thì hiện tại đơn.

6. are you doing

now -> dấu hiệu thì hiện tại tiếp diễn

7. reading

enjoy + V_ing

II.

1. of

fond of + V_ing/something

2. in

interested in + V_ing/something

3. at .... on

stay at home : ở nhà

on + thứ

4. about

tell somebody about

5. to .... by

go to somewhere

by + phương tiện

6. in

in + year

7. of

afraid of + V_ing

8. at

good at : giỏi về cái gì

9. in

live in somewhere

10. in 

born in somewhere

III.

1. D (vì tất cả là âm /t/)

2. B (vì tất cả là âm /θ/)

3. A (vì tất cả là âm /æ/)

IV.

1. My book hasn't been returned by Mary yet.

S + not + V + O.

→S(O) + be + not + V3 + by + S.

2. My house isn't as big as hers.

$S_1$ + be + short adj + er/more + long adj + than + $S_2$.

→$S_2$ + be + not + as/so + adj + as + $S_1$.

3. It's difficult to find a job at my age.

To + V + be + adj.

→It's + adj + to + V.

4. Lan isn't as young as Mai.

$S_1$ + be + short adj + er/more + long adj + than + $S_2$.

→$S_2$ + be + not + as/so + adj + as + $S_1$.

5. I was sent to school by my parents when I was six years old.

S + V + O.

→S(O) + be + V3 + by + S.

6. It's easy to get acquainted with the regulation in a new school.

To + V + be + adj.

→It's + adj + to + V.

7. A motorbike is more expensive than a bike.

$S_2$ + be + not + as/so + adj + as + $S_1$.

→$S_1$ + be + short adj + er/more + long adj + than + $S_2$.

Bài 1: 1.has worked(hiện tại hoàn thành) 2.didn't take (quá khứ đơn) 3.has gone(hiện tại hoàn thành) 4.received(quá khứ đơn) 5.gets(hiện tại đơn) 7.reading(enjoy+V-ing) Bài 2. 1.of (cấu trúc fond of) 2.in 3.at/on 4.about 5.to/by 6.in 7.of 8.at 9.in 10.in Bài 3. 1d-2b-3a-4a-5c Bài 4. 1.my book has not been returned by mary 2.my house is smaller than her house 3.its difficult to find a job at my age 4.lan is older than mai 5.I was sent to school by my parents when I was six years old 6.its easy to get acquainted with the regulation in a new school 7.a motorbike is more expensive than a bicycle