C1 look! The boys (swim) in the river C2 they asked us where our house (he) than C3 daisy's family (traved) ha noi sice 2020 C4 how long you (be) in HCM city? For 20 years C5 listen! The biveds ( sing) very well

`1` are swimming

`-` HTTD, dấu hiệu: Look!

`->` S + am/is/are + V-ing

`2` was

`-` Câu tường thuật: S + asked + O + wh + S + V(lùi thì)

`3` has travelled

`-` HTHT, dấu hiệu: since `2020`

`->` S + have/has + VpII + (since + time)

`4` have `-` been

`-` HTHT, dấu hiệu: for `20` years

`->` (Wh) + Have/Has + S + VpII?

`5` are singing

`-` HTTD, dấu hiệu: Listen!

`->` S + am/is/are + V-ing

`1.` are swimming

`-` DHNB: Look!

`->` Thì HTTD: `(+)` S + is/am/are + V-ing

`-` Vì "The boys" là S số nhiều `->` Dùng "are"

`2.` was

`-` Câu gián tiếp: Câu hỏi WH: S + asked sb/ wondered/ wanted to know + WH-word + S + V(lùi thì)

`3.` has travelled

`-` Thì HTHT (S + have/has + V3/ed) + since + mốc thời gian trong quá khứ

`-` Vì "Daisy's family" là S số ít `->` Dùng "has"

`4.` have you been

`-` DHNB: for 20 years `->` Thì HTHT

`-` How long + have/has + S + V3/ed?

`5.` are singing

`-` DHNB: Listen!

`->` Thì HTTD: `(+)` S + is/am/are + V-ing