2.isn't teaching

HTTD:tobe+Ving

3.do they eat

HTĐ với Wh question:Wh+do/does+S+V..?

4.doesn't often stay

HTĐ phủ định:S+do/does(not)+V.

5.did she get

QKĐ với Wh question:Wh+did+S+V...?

6.studies

HTĐ với danh từ số ít: S+V(s/es)

7.are playing

HTTD:tobe+Ving

8.do

HTĐ danh từ số nhiều :Vo

1. He went to work yesterday

2. She is not teaching EL at present

3. What do they eat everyday?

4. My mother  doesn't often stay at home

5. How did she get to work last week?

6. He usually studies hard

7. My children are playing sports now

8. Everyone I know usually does