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 QKĐ (V: thường)

(+) S + V2/ed 

(-) S + didn't + V1 

(?) Did + S+ V1?

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

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 HTTD 

(+) S + am/is/are + Ving 

(-) S + am/is/are + not + Ving 

(?) Am/Is/Are +S +Ving? 

DHNB: now, right now, (!), at present, at the moment,.....

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

1. will buy 

DHNB: tomorrow (TLD)

2. didn't eat

DHNB: last night (QKD)

3. studies 

4. Did you meet 

DHNB: yesterday (QKD)

5. isn't cooking / is reading 

DHNB: now (HTTD)

6. are

There are + no +  N số nhiều 

7. go 

DHNB :always (HTD)

8. Did you see

DHNB: last night (QKD)

9. throwing 

instead of + Ving: thay vì 

10. don't like 

If 1: If + HTĐ, TLĐ

`color{orange}{~MiaMB~}`

1. will buy

tomorrow -> TLĐ

2. didn't eat

last night -> QKĐ

3. studies

4. Did you meet

yesterday -> QKĐ

5. isn't cooking - is reading

now -> HTTD

6. is

7. go

always -> HTĐ

8. Did you see

last night -> QKĐ

9. throwing

instead of + V-ing

10. don't like

If 1: If + S + V-s/es, S + will + V-bare + O