1. This train is more convenient than all the other (most) => this train ...is the most covenient of the other....
2. The living room isn't as large as the kitchen (than) => the kitchen is larger than the living room
3. I'm not as fit as you (am) => You're fitter than i am
4. The student usually hold the concerts at the university => the concerts are held by the student
5. They have already repaired the roof of their house => the roof of their housê is already repaired (by them)
6. Your book is more intersesting than mine => my book is more boring than your book.
7. Scientists are studying the problem carefully => the problem is studied carefully by scientists
8. Hoa can't help us because she has a lot of work to do => if Hoa don't have a lot of work, she can help us.
9. They have already repaired the roof of their house => the roof the roof of their housê is already repaired (by them)