1.1. Do Phong, Duy and Vy usually walk to school?

2.2. Kelvin rarely reviews the lesson in the morning.

3.3. Are Gwen and Anna normally busy on Fridays?

4.4. The streets are always crowded at this time of the day. 

5.5. The children seldom have beefsteak for lunch. 

6.6. They don't often do exercise at the weekends. 

7.7. I sometimes forget to turn off the lights before leaving the room. 

8.8. The canteen doesn't frequently run out of drinking water.

∘∘ Kiến thức thì hiện tại đơn : 

−- Khẳng định : S + trạng từ chỉ tần suất + V(s/es) + .....      

−- Phủ định : S + don't/doesn't + trạng từ chỉ tần suất + V .......

−- Nghi vấn : Do/does + S + trạng từ chỉ tần suất + V ? 

−- Dhnb : every morning, every afternoon,every day , often , always , usually