31) we saw each other is two year ago
32) helping me move the table
33) hot enough for the children to swim in it
34) keeping leave her pen at home
35) always borrowing my pen
36) seen him for two months
37) her before she left for Ha Noi
38) did you learn English?
39) me an hour to paint the school gate
40) me two hours to go to Phu Bai airport by bus
41) took them two hours to do their homework
42) has a river and a big lake
43) is not easy to learn English
44) to go out for walk
45) travelling during rush hour
46) difficult for me to understand it
47) to bed early because I felt very tired