1. Speaking a foreign language is more difficult to read it

2.  The rain prevented the volunteers from mowing the old lady' lawns

3. After having done his homework, David went to bed

4. Bob denied taking Sue' calculator

5. David apologised for not coming on Saturday

6. I suggested going back to Singapore

7. Tim' mother accused John of stealing Tim' watch

8. Sue thanked Mr. Smith for his help

9. ..., the robber had escaped

10. I was having my breakfast when the phone called

11. Before Shella went out for the evening, she had washed her hair

12. They invited me to spend next week with them

13. He reminded Lan to post the letter

14. I haven't seen Bob since I was in Ho Chi Minh City

15. When thay got to the theatre, the play had begun

16 The driver stopped to buy some cigarettes

20.Speaking a foreign language is more difficult than reading it.

21.The rain prevented the volunteers from moving the old lady's lawns

22.After having done his homework, David went to bed

23.Bob denied having taken Sue's calculator

24.David apologised for not coming on Saturday

25.I suggested going back to Singpore

26.Harry congratulated Sue on getting engaged.

27.Sue thanked Mr.Smith for his help

28.,the robber had escaped

29.I was having my breakfast when the phone called

30.Before Shella went out for the evening, she had washed her hair

31.They invited me to spend next week with them

32.He reminded Lan to post the letter.

33. I haven't seen Bob since I was in HCM City

34.When they got to the theatre, the play had begun

35.The driver stopped to buy some cigarettes