`2.` We're at the supermarket

`3.` Mary isn't happy today

`4.` Ms. Cooper's my teacher

`5.` You're a good driver

`6.` I'm not at home

`7.` You aren't short

`8.` It's not very cold

`9.` He's late

`10.` They aren't at school

`@` Kiến thức thì hiện tại đơn : 

`-` Khẳng định : S + V(s/es) + .....      

`-` Phủ định : S + don't/doesn't + V .......

`-` Nghi vấn : Do/does + S + V ? 

`-` S+ is/ am/ are

`=` S+ 's/ 'm/ 're

`-` is/ am/ are+ not

`=` is/ am/ are+ n't

`2`. We're at the super market.

`3`. Mary isn't happy today.

`4`. Mrs. Cooper's my teacher.

`5`. You're a good driver

`6`. I amn't at home

`7`. You aren't short.

`8`. It isn't very cold.

`9`. He's late

`10`. They aren't at school.