16.I had her car repaired by a mechanic.
→I had a mechanic repair her car
17.If you worry, you will find it difficult to get to sleep.
→The more you worry,the more dificult you will find to get to sleep.
18.That can cost a lot of money.
→That can be cost a lots money.
19.She doesn't usually stay up so late.
→She is not used to staying up late.
20.We really ought to go home now.
→It's time for us to go home.
or
→It's time we went home now.
21.My friend and I are the same height.
→I am as tall as my friend.
22.They are building a new stadium here.
→A new stadium is being built here.
23.I'm sorry I can't swim.
→I wish I could swim.
24.The dentist will have to take out the infected tooth.
→The infected tooth will have to be taken out by the dentist.
or
→The infected tooth have to be taken out.
chúc em học tốt!!!!!