Exercise 3:
1. martha was delivering the documents to the department
2. a french architeet was designing the palace
3. mr.brown was writing the report in his office at 8 p.m yesterday
4. peter was painting those windows blue
5. the chef engineer was instructing all the workers of the plant
6. they were not eating dinner at present
7. we were painting the gate white
8. you were not driving him home
9. he was feeding the dogs
10. she in typing the report in the office
Exercise 4:
1. beth has finished the report
2. nobody has taken my briefcase
3. she has already finished the report at noon
4. the police have arrested five suspects already
5. kerrie hasn't paid the bill yet
6. i have no longer eaten a hamburger
7. i have opened the present
8. they have not read the book since we returned
9. you have sent the parcel
10. she hasn't phoned him yet
11. the delegates had received the information before the recess
(giải giúp mình)