13 They enjoy going shopping on Sundays mornings

14 ...exciting his books

15 ... having eaten breakfast, he went to work

16... forget to turn the light off before going out

17 ... I arrived, Jack had left the office

18 ... was having lunch, someone rang the bell

19 ...I went to the dentist was six months ago

20 ... studying Japanese 5 years ago

21 having done all his works, he went home

22 ... buying a new motorbike, he had saved enough money

23 ... the guests left, we tidied the house

25 ... the boy run away from the house

26 ... the thief empty his pockets

27 ... he leave the house early this morning

28 ... the robber come from the back door

29 ... already read the book several times, I didn't borrow it

30... very tired, she went to bed early