`21`. How many computers are there in your room?

`-` How many + N(số nhiều) + are there + O?

`22`. Did they go to Nam's birthday party last night?

`-` Did + S + V(bare) + O?

`-` last night `->` dấu hiệu nhận biết thì QKĐ

`23`. How old will she be next month?

`-` next month `->` DHNB thì TLĐ

`24`. He plays the guitar in his free time

`-` N(số ít) + V(s/es) + ....

`25`. My mother has just bought a new laptop

`-` bought `->` qk của buy

`-` a + N(số ít)

`26`. Where was your father born?

`-` Where + was/were+ S + born?

`-` your father `->` N(số ít) + was

`27`. She doesn't know how to use this machine

`-` S + don't/doesn't + V(bare) + O

`28`. How did they arrive at the airport yesterday?

`-` yesterday `->` DHNB thì QKĐ

`-` Did + S + V(bare) + O?

`29`. Were you at the fair yesterday afternoon?

`-` Was/were + S + V(bare) + O?

`-` yesterday afternoon `->` DHNB thì QKĐ

`30`. My sister had an earache last Sunday

`-` S + V(ed/C2) + ...

`-` an + UEOAI

`-` last Sunday `->` DHNB thì QKĐ

Công thức thì HTĐ (V: tobe)

(+) S + am/is/are ..

(-) S + am/is/are + not .. 

(?) Am/Is/Are + S + ... ? 

I + am

S số ít, he, she, it + is

S số nhiều, you ,we, they + are

Công thức thì HTĐ (V: thường)

S số ít, he, she, it 

(+) S + Vs/es

(-) S+ doesn't + V1 

(?) Does +S +V1?

S số nhiều, I, you, we, they

(+) S + V1 

(-) S+ don't + V1 

(?) Do + S+ V1? 

DHNB: always, usually, sometimes, often, never, seldom,....

Công thức thì TLĐ

(+) S + will + V1 

(-) S + won't + V1 

(?) Will + S+ V1? 

DHNB: in the future, in + năm ở TL, in + time, next week, next year, ....

Công thức thì HTHT

(+) S + has/have + V3/ed 

(-) S + has/have + not + V3/ed 

(?) Has/Have + S+ V3/ed?

DHNB: before, since + mốc thời gian, for + khoảng thời gian, yet, already, just,....

Công thức thì QKĐ (V: to be)

(+) S + was/were + ... 

(-) S + was/were + not ... 

(?) Was/Were + S ... ? 

S số ít, I, he, she, it + was

S số nhiều, you, we ,they + were

Công thức thì QKĐ (V: thường)

(+) S + V2/ed 

(-) S + didn't + V1 

(?) Did + S+ V1?

DHNB: ago, last (year, month ...), yesterday, in + năm QK, ...

-------------------------------------------------

21. How many computers are there in the room?

How many + N số nhiều + are there ? hỏi số lượng 

22. Did they go to Nam's birthday party last night?

23. How old will she be next month?

DHNB: next month (TLD)

24. He plays the guitar in his free time.

play the guitar: chơi đàn ghi-ta

in + one's free time: trong thời gian rảnh của ai 

25. My mother has just bought a new laptop.

DHNB: just (HTHT)

a + ADJ + N số ít

26. Where was your father born?

27. She doesn't know how to use this machine.

how + to V: cách để làm gì 

28. How did they arrive at the airport yesterday?

How + trợ động từ + S+ V1? hỏi phương tiện

arrive at + nơi nhỏ 

29. Were you at the fair yesterday afternoon?

30. My sister had an earache last Sunday.

`color{orange}{~LeAiFuRuiHuiBao~}`