`1`. If you play games too much, you willl have no time to study.

`->` If 1: If + S1 + Vs/es, S2 + will/can + Vinf

`2`. If Mary understood the questions, she could do this test.

`->` If 2: If + S1 + V2/ed S2 + would/could + Vinf

`3`. Although he had to study for the exam, he stayed up late to watch the match between VN and Malaysia.

`->` Although + S + V: mặc dù

`4`. The city where I live in has beautiful beaches.

`->` "where" thay cho từ chỉ nơi chốn

`5`. I asked Nam how may brothers he had.

`->` Câu trần thuật có từ để hỏi: S + asked + (O) + từ để hỏi + S2 + V lùi thì

`6`. The car has been sold recently.

`->` Câu bị động hiện tại hoàn thành: S + have/has + been + Vpp

`1.`If you play games too much, you willl have no time to study

( câu điều kiện loại 1=> If + S1 + Vs/es, S2 + will/can + Vnt)

`2.`If Mary understood the questions, she could do this test

( câu điều kiện lại 2 => If + S1 + V2/ed, S2 + would/could + Vnt)

`3.` Although he had to study for the exam, he stayed up late to watch the match between VN and Malaysia 

( Although + S + V)

`4.` The city where I live in has beautiful beaches

( where = chỉ nơi chốn )

`5.` I asked Nam how may brothers he had

( S + asked + (O) + từ để hỏi + S2 + V lùi thì)