6. small / thin / sister / white / and / his / lips / teeth / has.

=> His sister has small white teeth and thin lips. 

7. hot / go / when / I/ go swimming / it / is.

=> I go swimming when it is hot.

8. camping / often / do / how / you / go?

=> How often do you go camping ?

9. stay / grandparents / vacation / are / with / next / we / to / we / to / our / going / summer. 

We are going with our grandparents to next vacation.  ( Câu này hình như sai đó em, xem lại rồi cmt cho a nha )

10. in / the / Nile River / the / longest / the / is / world. 

=> Nile River is the longest in the world.
Chúc em học tốt !

`6.` His sister has small white teeth and thin lips. 

`7.` I go swimming when it is hot.

`8.` How often do you go camping?

`9.` We are going to stay with our grandparents next summer vacation.

`10.` The Nile River is the longest in the world.

`-` Câu `6, 7, 8, 10` đều dùng thì HTĐ

`+` Công thức :

`-` S + V s/es

`-` S + do/does + not + V s/es

`-` Do/does + S + V

`+` Câu `9` ta dùng HTTD

`+` Công thức :

`-` S + tobe + V_ing

`-` S + tobe + not + V_ing

`-` Tobe + S + V_ing