`34.` Birds builttheir nests in summer and fly to the South in winter.
`=>` Thì hiện tại đơn, S + V(s/es)
`38.` How long have Bob and Mary been married?
`=>` Thì hiện tại hoàn thành : S + have/has + P2
`39.` Have you receive any letter from your parents yet?
`=>` Thì hiện tại hoàn thành : S + have/has + P2
`48.` My brother has finished his second novel so far.
`=>` Thì hiện tại hoàn thành : S + have/has + P2
`63.` She is buying a lot of flour, I think she is going to make some cakes.
`=>` be going to + V: Diễn tả tương lai gần
`66.` Some animals don't eat during winter.
`=>` Thì hiện tại đơn S + don't/doesn't + V
`67.` He drives too dangerously, he will have an accident.
`68.` John was watching TV at 8 last evening.
`=>` Có at 8 last evening : dấu hiệu thì quá khứ tiếp diễn
S + was/were + Ving + ...