1,He had to give the money back. (obliged)

2,I didn’t need any help to repair my bicycle. (repaired)

3,Teachers from the British Council started this school. (set)

`1` He was obliged to give the money back.

`-` S + have to + V-inf + O : Ai đó phải làm gì.

`=>` S + be + obliged + to V + O : Ai đó có nghĩa vụ phải làm gì.

`2` I had my bicycle repaired on my own.

`-` Bị động đặc biệt.

`@` S + have + sth(bị động) + V3/Vpp + O.

`3` Teachers from the British Council set off this school.

`-` start `=` begin `=` set off : bắt đầu (V)

`-` Thì quá khứ đơn : S + V(quá khứ) + O.

`1,`He was obliged to give the money back.

- be obliged to do something = have to V : có nghĩa vụ phải làmv việc gì

`2,`My bicycle didn't need any help to be repaired.

- Bị động : need to be V3 : cần được làm việc gì

`3,`This school was set up by teachers from the British Council.

- set up = start (phr.v): tổ chức / thiết lập / xây dựng