`3.` Is this her new smartphone?

`-` Do/does +  N + belong to + O?

`=` Tobe + N + TTSH + N?

`4.` friend of mine

`-` one of one's friends `=` a friend of ĐTSH

`5.` This villa isn't theirs

`-` TTSH + N `=` ĐTSH

`7.` Minh said that he wanted to become a member of our school IT club

`-` Câu gián tiếp:

S  + said + (that) + S + V(lùi thì)

`-` lùi thì: HTĐ `->` QKĐ

`8.` Lan said that her brother would use an app on her smartphone to practice speaking regularly

`-` will -> would

`3.` Is this her new smartphone?

`-` TTSH + N

`-` belong(chia) to Sb : thuộc về ai đó

`4.` Lan, a friend of mine, will help me with this project.

`-` a friend of sb : 1 người bạn của ai đó

`5.` His villa isn't theirs.

`-` tobe the owner of sth: là chủ sở hữu của ai đó

`-` ĐTSH = TTSH + N

`7.` Minh said that he wanted to become a member of the school IT club.

`8. ` Lan said that her brother would use an app on her smartphone to practice speaking regularly.

`-` Bị động dạng câu kể:

 S + say(s)/said hoặc tell/told + (that) + S + V- lùi thì