33. He was allowed to leave  after having been answered by the police

34. It's the first time I have seen that men here 

35. The furniture was too expensive for me to buy it

36. Travelling by air always makes me feel nervous

33.He was left by the police after they had questioned him.

=>câu bị động ở thì quá khứ đơn: 

S1+Vpi+O=>O+was/were(not)+Vpii

34.It's the first time I have ever seen that man here

S+have/has+never+Vpii+before=It's the first time+S+have/has+ever+Vpii+..

35.The furniture was too expensive for me to buy.

S1+tobe+so+adj+that+S2+V=S1+tobe+too+adj+for+S2+to+adj

36.Travelling by air always makes me nevours.

S+adj+when+do smt

=Doing smt+makes +S+adj