=>
33. They had been on board before he arrived at the airport
→ As soon as he arrived at the airport, they had been on board.
34. How long have you possessed that Chanel bag?
→ When didyou start possessing that Channel bag?
35. " Why do I have to conduct this research ?" she asked me
→ She asked me why she had to conduct that research.
36. He needs to talk to the psychologist about his current situation
→ It is necessary for him to talk to the psychologist about his current situation.
37. It is very useful to know English.
38. It has snowed since 5 o'clock.
39. Hung isn’t as tall as Nam.
40. What time did you go to bed yesterday?
