1. If we are busy, we won't go to the extra tutor.

( Câu điều kiện loại 1 : If + S + V(hiện tại đơn), S + will + V(inf) + O )

2. Unless the boys have a good fountain pen, he can't win the handwriting contest.

( Cấu trúc unless : unless = if not )

3. He wanted to know if we were going to the cinema.

( Câu tường thuật : S + asked/ wanted to know/ wondered + if/ weather+ S + V )

4. She wanted to know what they were doing.

( Câu tường thuật : S + asked/ wanted to know/ wondered + wh- + S + V(lùi thì) )

5. She asked her boyfriend which dress he liked best. 

( Câu tường thuật : S + asked/ wanted to know/ wondered + wh- + S + V(lùi thì) )