A

1. I'm doing the homework now

2. My brother are watching TV

3. Our dog is eating its food

4. The sun is shining

5. Maria is wearing a coat

6. You are playing the guitar

7. My best friend is sitting next to me

8. My mother is cooking breakfast

B

1. I'm not doing the homework now

2. My brother are not watching TV

3. Our dog is not eating its food

4. The sun is not shining

5. Maria is not wearing a coat

6. You are not playing the guitar

7. My best friend is not sitting next to me

8. My mother is not cooking breakfast

`A`.

`1.` I'm doing the homework now.

`2.` My brothers are watching TV.

`3.` Our dog is eating its food.

`4.` The sun is shining.

`5.` Maria is wearing a coat. 

`6.` You're playing the guitar.

`7.` My best friend is sitting next to me.

`8.` My mother is cooking breakfast.

`B.`

`1.` I'm not doing the homework now.

`2.` My brothers aren't watching TV.

`3.` Our dog isn't eating its food.

`4.` The sun isn't shining.

`5.` Maria isn't wearing a coat. 

`6.` You're not playing the guitar.

`7.` My best friend isn't sitting next to me.

`8.` My mother isn't cooking breakfast.

`=>` Giải thích cấu trúc thì hiện tại tiếp diễn :

`+)` S + am/is/are+ Ving

`-)` S + am/is/are + not + Ving

`?)` Am/is/are + S + Ving ?