* Cấu trúc thì Hiện tại đơn 

(+) S + V(es/s)/ V

(-) S + don't/ doesn't + V 

(?) Do/ Does + S +V?

- DHNB: every, often,...

* Cấu trúc thì Hiện Tại Tiếp Diễn

(+) S + am/is/are + V-ing

(-) S + am not/ isn't/ aren't + V-ing

(?) Am/ Are/ Is + S + V-ing?

- DHNB: now, Look,...

* Cấu trúc thì quá khứ đơn 

(+) S +V (ed/ cột 2) 

(-)  S + didn't + V 

(?) Did + S + V?

- DHNB: ago, last,..

* Cấu trúc thì HTHT 

(+) S + have/has + V-pp 

(-) S + haven't/hasn't + V-pp

(?) Have/Has + S + V-pp+...?

- DHNB: yet, already,..

____________________________________________

`1.` is singing 

`2.` go 

`3.` likes - like

`4.` are staying 

`5.` read 

`6.` is running

`7.` listening 

`8.` are

`9.` are

`10.` doesn't go

`11.` go

`12.` write

`13.` will have

`14.` eat

`15.` were

`16.` are you doing

`17.` Does - walk

`18.` didn't play

`19.` Is hai walking

`20.` did-live