`1`.If I were him , I would choose English

`\rightarrow` CĐK Loại 2 :

`-` If - clause : Thì QKĐ : S + Ved / V2

`-` Main - clause : Thì TLTQK : S + would + V

`2`.We used to go fishing at weekends

`\rightarrow` `\text{S + used to + V :}` Đã từng

`3`.This room should be cleaned everyday

`\rightarrow` Câu bị động `-` Should : S + should be + V3 / PII ( by O )

`4`.We have known each other since we were small

`\rightarrow` Thì HTHT : S + have / has + V3 / PII

`\rightarrow` Đặc điểm nhận dạng : since

`5`.She is looking forward to seeing her friends again

`\rightarrow` Be looking forward + to V-ing : Mong chờ điều gì

`\text{@ TheFox}`

1. If i was him, I would choose English

cấu trúc câu điều kiện loại 2: If + S + V( quá khứ đơn), S + would/could/might + V 

2. We used to go fishing at weekends

cấu trúc used to + V

3. This room should clean everyday

4. We have known each other since we were small

giải thích: hiện tại hoàn thành + since + quá khứ đơn

5. She is looking forward to see friends again. 

cấu trúc: looking forward + to V