`1`.They have participated in raising funds for the homeless for 2 years

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

`\rightarrow` Đặc điểm nhận dạng : for

`2`.Murray advised his students that they should learned new words everyday

`\rightarrow` Câu tường thuật : S + said / asked / ... + O + that + S + V ( lùi thì )

`3`.There used to be an old temple in Hoi An ancient town a long time ago

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

`4`.They used to be good students when they were at university

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

`5`.Letting children play in the kitchen isn't safe

`\rightarrow` Thì HTĐ ( ĐT Tobe - CPĐ ) : S + be not + adj / n

`6`.She has learnt Japanese since she was a little girl

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

`\rightarrow` Đặc điểm nhận dạng : since

`7`.Ba isn't old enough to drive a car

`\rightarrow` Enough : S + be / be not + adj + enough ( for O ) + to do sth

`8`.It is dangerous to put a knife into an electrical socket

`\rightarrow` It is + adj + to do sth : Như thế nào để làm gì

`9`.They used to get up late

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

`10`.Mr.Ba and Mr.Tam have taught Math since 2010

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

`\rightarrow` Đặc điểm nhận dạng : since

`\text{@ TheFox}`