1 I wish I could show you around the city. ( mệnh đề "wish" thì phải lùi thì )
2 He asked me if I was leaving for Hanoi the following day. ( S +asked + O + if + S2 + V lùi thì )
3 He hasn't smoked cigarettes for three years. ( for three years -> hiện tại hoàn thành )
4 A new computer will be bought by my sister next week. ( S + will be + Vpp + place + by SO + time )
5 It's not very likely that they will succeed. ( It's not likely : chỉ khả năng )