15/ Do you like playing badmin ton?
- Are you interested in playing badminton?
16/ The last time they played tennis was two years ago.
→They haven't played tennis for two years.
17/ About thirty million people are watching this program.
This program is watched by thirty million people.
18/ The last time I saw him was two days ago.
I haven't seen him for two days.
19/ They have painted their house blue and white.
→Their house have been painted blue and white.
20/ Lan is the best student in our class.
→ Nobody in our class is better than Lan.
21/ We are studying in a very large classroom now.
→The classroom which we are studying in now is very large.
22/ We haven't had a party last Christmas
The last time we had a party was last Christmas.
23. Barbara cooks better than Mike does.
Mike doesn't cooks better than Barbara does.
24. She asked, "How many Japanese students are there in your class, Tom?"
She asked Tom How many Japanese students there were in his class.
25. Julia has worked for this company for six years.
Julia started working for this company six years ago.
26. I don't find it difficult to get up early in the morning.
I am used to getting up early in the morning.
27. Although the weather was bad, we went to school on time.(spite)
In spite of the bad weather, we went to school on time 
29. Unless he changes his way of living, he'll meet a lot of troubles. (if)
If he changes his way of living, he won't meet a lot of troubles.
30. It's important to do the homework.
- Doing the homework is important.
31. No one in this class is more intelligent than Peter.
Peter is the most intelligent in this class.
32. She isn't old. She cannot get married.(combine using "enough")
She is not young enough to get married.