2, Does Bobby ussually do homework at his friend 's house?

3, The girls always take turns to look after their ill mother

4, Lia 's elder sister doesn't often cook breakfast for her

5, Why do you learn more than 50 new words every day?

6, The zookeeper feeds the baby elephants special milk every three hours

7, Do your friends use flashcards when they learn new vocabulary?

8, My classmates don't really enjoy going camping near the beach 

9, I often take my dogs to the park and play Frishbee with them

10, The boy doesn't often go mountain biking with other members in the club

Công thức thì HTĐ: (+): S + is/am/are // V (es/s/nt) ...

(-): S + is/am/are + not ... // do/does + not + Vnt...

(?): ( Wh) + is/am/are //do/does + S + ...?

Các trạng từ often, always, usually, đứng sau V tobe( is, am, are) và sau các Va dạng phủ định ( don't, doesn't,...) nhưng đứng trước V thường ( get, do , make,..)