`Đáp` `án:`

1. My friend is playing football at school now. 

DHNB: now (HTTD)

S + am/is/are + Ving

2. I go to school early every morning. 

DHNB: every morning (HTĐ)

S + V1/s/es

go to sw: đi đến đâu

V + ADV 

3. She always wears her uniform to school. 

DHNB: always (HTĐ)

S + V1/s/es

Tính từ sở hữu + danh từ 

ADV chỉ tần suất + V 

4. I am doing the homework in the library now. 

DHNB; now (HTTD)

S + am/is/are + Ving

5. They have a big music room. 

S + has/have + N 

a + adj + N 

6. We are studying English at the moment. 

DHNB: at the moment (HTTD)

S + am/is/are + Ving

7. He is never late for class. 

S + am/is/are + adj: thì HTĐ

tobe + ADV chỉ tần suất 

8. My brother rides his bike to school every day.

DHNB: every day (HTĐ)

S + V1/s/es

9. The students are watching a science video. 

S + am/is/are + Ving: thì HTTD

a + N số ít, đếm được 

10. They usually have lunch at the canteen. 

ADV chỉ tần suất + V 

DHNB: usually (HTĐ)

S + V1/s/es

11. I am not in my classroom. (dư chữ the - hoặc đề thiếu / sai)

S + am/is/are + (not) + O: thì HTĐ