Exercise 10:

1, frightening -> frightened

2, were took -> were taken

3, helped -> were helped

4, composing -> composed

5, announcing -> announced

6, been -> bỏ

7, has -> has been

8, accompany -> accompanied

9, was giving -> was given

10, worry -> worried

11, were happened -> happened

12, go to -> going

13, to work -> to have worked

14, let -> allowed

15, to service -> serviced

16, been -> were

17, been -> bỏ

18, a writing -> a written

19, got tore -> got torn

20, crossed -> was crossing

Ex10 :

1. frightening → frightened

2. were took → were taken

3. helped → were helped

4. composing → composed

5. announcing → announced

6. been → ∅

7. has → has been

8, accompany → accompanied

9. was giving → was given

10. worry → worried

11. were happened → happened

12. go to → going

13. to work → to have worked

14. let → allowed

15. to service → serviced

16. been → were

17. been → ∅

18. a writing → a written

19. got tore → got torn

20. crossed → was crossing

@Chúc học tốt!