`20.` walks

- DHNB: walks

- Thì HTĐ

`21` does Mary usually get up

- DHNB: ususually

- Thì HTĐ

`22.` doesn't wash

- DHNB: every weekend

- Thì HTĐ

`23.` aren't studying

- DHNB: at present

- Thì HTTD

`24.` is having

- DHNB: now

- Thì HTTD

`25.` are making 

- DHNB: at the moment

- Thì HTTD

`26.` Does she like

- DHNB: Câu này nói về một sở thích

- Thì HTĐ

`27.` goes

- DHNB: Every week

- Thì HTĐ

`28.` Như câu 21. does your father usually get

- DHNB và thì như câu 21.

`29.` don't go

- DHNB: Diễn tả một sự luôn đúng

- Thì HTĐ

`30.` don't

- Như câu trên

`31.` goes

- DHNB: Diễn tả một sự thật luôn đúng

- Thì HTĐ

`32.` don't visit

- DHNB: very often

- Thì HTĐ

`33.` Does he go

- DHNB: every day

- Thì HTĐ

`34.` Did she come

- Thì QKĐ

`35.` is playing

- DHNB: Look!

- Thì HTTD

`36.` is sleeping

- DHNB: Be quiet!

- Thì HTTD

`37.` is smoking

- DHNB: Look!

- Thì HTTD

`38.` have lived

- DHNB: since

- Thì HTHT

`39.` has just washed

- DHNB: just

- Thì HTHT

`40.` cleaned

- DHNB: yesterday

- Thì QKĐ