`1.` My sister likes collecting stamps

`-` like doing sth: thích làm gì

`2.` Tuan and Minh play badminton every afternoon

`3.` They enjoy collecting old coins

`-` enjoy doing sth: thích làm gì

`4.` The Earth goes round the run

`5.` We usually start our lesons at 7.30

`6.` My sister is interested in going camping at the weekend

`-` be interested in doing sth: thích làm gì

`*` HTĐ:
`(+)` S + V(s/es) + O

`(-)` S + do/does + not + V_inf + O
`(?)` Do/does + S + V_inf + O?

`+` 

`(+)` he/she/it/DTSI + Vs/es

`(-)` he/she/it/DTSI + doesn't+ V

`(?)` Does+ he/she/it/DTSI+ V + O?

`+` 

`(+)` I/you/we/they/DTSN + V_inf

`(-)`  I/you/we/they/DTSN + don't + V_inf

`(?)` Do +  I/you/we/they/DTSN + V + O?