1. Does he always play football after school?

2. Do the students often ride their bicycles to school?

3. Susan sometimes helps her mother to do the housework.

4. Are you usually at home in the evening?

5. Do Duy and Kha go to the judo club every Wednesday?

6. Her mother is frequently busy cooking dinner at 5 p.m. 

-> Busy + V-ing: Bận rộn...

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* HTĐ:

- V thường:

(+) S + (Adv tần xuất) + V(s/es)

(-) S + do/does + not + V-inf

(?) (Wh_question) + do/does + S + V-inf?

- N số ít -> S + Vs/es - S + doesn't + V 

- N số nhiều -> S + (don't) V-inf

- V tobe: 

(+) S + is/am/are + (Adv tần xuất) + O

(-) S + is/am/are + not + O

(?) (Wh_question) + is/am/are + S + O?

- I + am

- N số ít -> S + is

- N số nhiều -> S + are