`8`. My dad was eighteen years old when he left school.

- Qúa khứ đơn: S + V2/ed 

                         S + were/was + ...

- when + S + V: khi 

- Dịch: Ba tôi 18 tuổi khi ông ấy rời trường.

`9`. There were a lot of people in the shopping centre yesterday.

- yesterday: quá khứ đơn

- There + was/were + ...

- a lot of + N số nhiều: rất nhiều

`10`. We visited some beautiful places on holiday last year.

- last year: quá khứ đơn. S + V2/ed 

`8`.My dad left school when he was eighteen years old 

`\rightarrow` Thì QKĐ : S + Ved / V2

`\rightarrow` Thì QKĐ ( ĐT Tobe ) : S + was / were + adj / n

`9`.There were a lot of people in the shopping centre yesterday

`\rightarrow` Thì QKĐ ( ĐT Tobe ) : S + was / were + adj / n

`\rightarrow` Đặc điểm nhận dạng : yesterday

`10`.We visited some beautiful places on holiday last year

`\rightarrow` Thì QKĐ : S + Ved / V2

`\rightarrow` Đặc điểm nhận dạng : last

`\text{@ TheFox}`