1. Mai brushes her teeth twice a day.

(-) Mai doesn't brush her teeth twice a day.

(?) Does Mai brush her teeth twice a day?

2. Ba and Lan sometimes go to the zoo.

(-) Ba and Lan don't sometimes go to the zoo.

(?) Do Ba and Lan sometimes go to the zoo?

3. I usually play sports

(-) I don't usually play sports.

(?) Do you usually play sports?

4. He is listening to music now

(-) He isn't listening to music now.

(?) Is he listening to music now?

5. She sometimes has a picnic

(-) She doesn't sometimes have a picnic

(?) Does she sometimes have a picnic?

6. They often go camping on Sundays

(-)They don't often go camping on Sundays

(?) Do they often go camping on Sundays?

7. Nam often goes to the park

(-) Nam doesn't often go to the park

(?) Does Nam often go to the park?

8. She always has some orange juice after lunch

(-) She doesn't always have some orange juice after lunch

(?) Does she always have some orange juice after lunch?

9. We sometimes have some bananas

(-) We don't sometimes have some bananas

(?) Do we sometimes have some bananas?

10. Miss Thu usually eats some vegetables.

(-) Miss Thu doesn't usually eat some vegetables.

(?) Does Miss Thu usually eat some vegetables?