`1` My sister can swim well but she can't play badminton 

`=>` but : nhưng

`=>` Mệnh đề 1 + but + mệnh đề 2 

`2` Your city is bigger than my city 

`=>` So sánh hơn : S1 + be + tính từ ngắn thêm đuôi er + than + S2

`=>` So sánh ko bằng : S1 + be + not + as/so + adj/adv + as + S2

`3` I spend a lot of time outdoors playing sports 

`=>` spend time doing sth : dành thời gian làm gì

`=>` so : vì vậy 

`=>` Mệnh đề 1 , so + mệnh đề 2 

`4` He has studied English since 2000 

`=>` S + started/began + to V/V-ing + ... + time

`=>` S + has/have + Ved/V3 + for/since + time

`=>` He là số ít `->` chia has 

`1`. My sister can't swim well, but she can't play badminton.

`⇒` 2 hành động này trái ngược nhau

`⇒` Dùng but

`2`. Your city is bigger than my city.

`⇒` Cấu trúc: S + to be + adj_er + than + S1

`3`. I spend a lot of time outdoors enjoying sports.

`⇒` Cấu trúc: S + spend + time + Ving

`4`. He has studied English since 2000.

`⇒` Cấu trúc: S + has/have + Vpp + since + năm.