`1.` It's not a good idea to spend too much time playing computer games.

`-` It's not a good idea to + V-inf `~` S + shouldn't + V-inf 

`-` Spend time + V-ing : dành thời gian làm gì

`2.` My father said the cost of living in Hanoi was increasing considerably.

`-` HTTD `->` QKTD

`-` Trần thuật : S + says/said/told…(that ) + S + V ( đổi ngôi / lùi thì )

`3.` We really enjoyed the trip to the mountain last weekend although rained very heavily.

`-` last là dấu hiệu chia thì QKĐ : S + V2/ed + ...

`-` Although/ Though/ Even though + clause (S+V) : mặc dù

`1.` It isn't a good idea to spend too much time on computer games. 

`-` Cấu trúc: It + tobe (not) + a good idea + to do sth: làm gì đó (không phải) là một ý tưởng tốt 

`-` spend time (on) doing sth/sth: dành thời gian làm việc gì/cho thứ gì

`2.` My father said the cost of living in Hanoi was increasing considerably.

`-` Câu tường thuật dạng câu kể:

`->` Cấu trúc: S + said + (that) + S + V lùi thì

`-` thì HTTD `->` Thì QKTD (was/were + V-ing)

`3.` We really enjoyed the trip to the mountain last weekend although it rained very heavily. 

`-` the trip to sth/somewhere: chuyến đi đến đâu 

`-` Dấu hiệu của thì QKD: last weekend

`-` "heavy" `->` heavily (adv): nặng (bổ nghĩa cho V = mưa rơi nặng hạt)