`21.` was

`@` two years ago: `DHNB` thì QKĐ
`-` My cousin là chủ ngữ số ít `->` dùng tobe "was"

`+` Cấu trúc: S + was/were

`22.` will cycle

`@` tomorrow: `DHNB` thì TLĐ

`+` Cấu trúc: S + will + V_inf

`23.` am staying

`@` at the moment: `DHNB` thì HTTD
`+` Cấu trúc: S + am/is/are + V_ing

`24.` didn't go

`@` when I was: `DHNB` thì QKĐ
`+` Cấu trúc: S + didn't + V_inf

`25.` taught

`@` four years ago: `DHNB` thì QKĐ

`+` Cấu trúc: S + Ved/V2

`26.` went - had

`@` last year: `DHNB` thì QKĐ

`27.` arrives

`->` chia ở thì HTĐ
`-` My bus là chủ ngữ số ít `->` động tử thêm "s"

`28.` didn't have

`@` last week: `DHNB` thì QKĐ
`29.` moved

`@` in 2010: `DHNB` thì QKĐ

`30.` Did Jenay go

`@` yesterday: `DHNB` thì QKĐ