`@` Công thức HTĐ : 

`1`. Thể khẳng định ( Affirmative )

`(+)` S + Vs/es + ...

`→` Nếu là 'She/He/It' thì Verb thêm " s " hoặc " es "

`→` Nếu là 'I/We/You/They' thì Verb nguyên mẫu ( V_bare )

`2`. Thể phủ định ( Negative )

`(−)` S + don't/doesn't + V ( bare ) + ...

`−` I , You , We , They − Do 

`−` He , She , It − Does 

`3`. Thể nghi vấn:

`(?)` Do/does + S + V ( bare ) + ...

`−` Trạng từ nhận biết: always, usually, often, sometimes, never, every,...

`−` Chú ý : 

`−` She , he , it + Vs/es

`−` I , you , we , they , N and N + V.inf

`-----------------` 

`1`. If you're looking for your file, it is.

`2`. She gives on the table.

`3`. The Great Barrier Reef is over 2,000 kilometers long.

`4`. My mother doesn't usually wash my clothes. I do it by myself.

`5`. I am an English teacher at Amsterdam high school in Amsterdam, New York.

`6`. What do you do every weekend?

`7`. There are actually over two dozen states of matter.

`8`. Her younger sister works at a hospital as a nurse.

`9`. He always watches TV before going to bed.

`10`. Octopuses have three hearts, nine brains, and blue blood.

`11`. They play basketball once a week to relieve stress after long hard working days. We are not very pleased with our marriage.

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,....

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

1. is 

2. gives

DHNB: twice a month

3. is 

4. doesn't usually wash

DHNB: usually

5. am

6. do / do 

DHNB: every weekend

7. are 

8. works 

9. watches

DHNB: always 

10. have

11. play

DHNB: once a week

12. aren't 

DHNB: sometimes 

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