=>
4/
1. began ( ago -> qkđ)
2. am sweeping ( what are you doing -> đang làm gì -> HTTD)
3. was teaching ( this time yesterday -> qktd)
4. felt ( qktd when qkđ)
5. fight (often -> htđ)
6. bought ( ago -> qkđ)
7. have built ( since -> htht)
8. has lost ( many times -> htht)
9. brings ( always -> htđ)
10. tell ( every -> htđ)

5/
1. when
2. since
3. ago
4. for
5. since
6. ago
7. for
8. since
9. when
10. ago

6/
1. Chicken wings are often fried for Sophia's children by her.
2. The neighborhood has been cleaned up for 2 hours.
3. The dog is being taken for a ưwalk in the park by my grandma now.
4. Vegetables are always chosen very carefully by Anna.
5. My motorbike was stolen by a thief last night.
6. Ao Dai is often worn by students in HCM city on Monday.
7. Food has been given away for homeless people by Mr.Bean since 4 o'clock.
8. The party was held in their school 3 days ago.
9. The charitable organization was founded by my team in 2000.

7/
1. tutoring/helping
2. having/to pass
3. to help/to do
4. to join/speaking
5. carving/to carve
6. Making/to make
7. sleeping/to prepare
8. to have/to donate
9. to protect/to throw

8/
1. How often does John wear uniform to school?
2. How long did they steal my new motorbike last night?
3. How far will you jog in the morning?
4. How long have you known Peter?
5. When did the film begin yesterday?
6. What is your son thinking about at the moment?
7. When are you going to have a picnic?
8. How does your mum go to work?
9. Whose T-shirt is Bean trying on
10. Who are you going to camping with this weekend?
11. Why did your mom buy flour and eggs?

Exe 4.
1. began
2. am sweeping
3. was teaching
4. felt
5. fight
6. bought
7. have built
8. has lost
9. brings
10. tell

Exe 5.
1 , 9. when
2.5.8. since
3.6.7. ago
4.7. for

Exe 6.
2. The neighborhood has been cleaned up for 2 hours.
4. Vegetables are always chosen very carefully by Anna.
5. My motorbike was stolen by a thief last night.
6. Ao Dai is often worn by students in Ho Chi Minh city on Monday.
8. The party was held in their school 3 days ago.

Exe 7.
1. tutoring-helping
2. having-to pass
3. to help-to do
4. to join-speaking
5. carving-to carve
6. Making-to make
7. sleeping-to prepare
8. to have-to donate

Exe 8.
1. How often does John wear uniform to school ?
5. When did the film begin yesterday ?
7. When are you going to have a picnic ?
8. How does your mum go to work ?
9. Whose T-shirt is Bean trying on ?
10. Who are you going to camping with this weekend?
11. Why did your mom buy flour and eggs ?

Nhiều quá nên nhiều câu hơi dễ mình để lại T^T