28. The teacher asked Tom what his mother was doing then.

S + asked + O + Wh + S+ V (lùi thì)

HTTD --> QKTD

now --> then 

29. It is fashionable for young people to wear short skirts and faded jeans.

It's + ADJ + (for O) + to V 

30. If she didn't eat too much meat, she wouldn't be overweight.

if 2: If + QKD, S + would / could + V1 

31. What did you do with the money which your grandparents gave to you?

N (vật) + which + V / S  + V 

32. The couple who have just moved in next door are from Ireland.

N (người) + who + V 

`color{orange}{~MiaMB~}`