`1.` I was tired last night, so I went to bed early.

`-` last night `->` QKĐ

`2.` It is raining heavily now.

`-` now `->` HTTD

`3.` Does your mother cook dinner every evening ?

`-` every `->` HTĐ

`4.` I visited my grandparents two days ago.

`-` ago `->` QKĐ

`5.` We were not at school yesterday.

`-` yesterday `->` QKĐ

`6.` My sister plays the piano very well.

`7.` Nam and his brother aren't doing homework at the moment.

`-` at the moment `->` HTTD

`8.` What did you do last weekend ?

`-` last `->` QKĐ

`9.` He is eating breakfast because he is hungry now.

`-` now `->` HTTD

`10.` How often do you play badminton with your friends ?

`-` often `->` HTĐ

`----------`

`@` HTĐ :

`-` Be :

(+) S + am/ is/ are + N/ Adj

(-) S + am/ is/ are + not + N/ Adj

(?) Am/ Is/ Are + S + N/ Adj? 

`***` Wh - word + am/ is/ are + S +…?

`-` V :  

(+) S + V_s/es/inf

(-) S + do/ does + not + V_inf      

(?) Do/ Does + S + V_inf +…?

`***` Wh - word + do/ does + S + V_inf +…?

`-` DHNB : always, usually, often, sometime, every day/week/month/..., once/twice a week, ...

`@@@`

`@` HTTD :

(+) S +am/ is/ are + V_ing + O

(-) S + am/ is/ are+ not + V_ing + O

(?) Am/is/are+ S + V_ing+ O ?

`-` DHNB : At present, at the moment, now, right now, at, look!, listen! .…

`@@@`

`@` QKĐ :

`-` Be :

(+) S + was/ were + O

(-) S + was/ were + not + O

(?) Was/Were + S + N/Adj ?

`-` V :

(+) S + V_ed/2 + O

(-) S + did not + V_inf + O

(?) Did (not) + S + V_inf + O ?

`***` Wh-word + did + S + V_inf ?

`-` DHNB : esterday, ago , last night/ last week/ last month/ last year, ago(cách đây), when.