2. Your taste in art is not the same as my taste.
3. I was at the theatre last night and so was he. (SO)
4. The government don't allow the citizens to use illegal drugs.
The citizens are not allowed to  use illegal drugs.
5. The blue house is not as big as the green one.
The green house is bigger than the blue house
6. Columbus discovered America in the 15th century.
America was discovered by Columbus  in the 15th century.
7. Mr. Thinh has designed the new building since 1989.
The new building has been designed by Mr Thinh since 1989
8. It is two months since I saw him.
I haven't seen him for 2 months
9. I haven't seen her since she left for Hanoi.
I last saw her was when  she left for Hanoi.
10. Vietnamese people celebrate Lunar New Year around January or February.
Lunar New Year is celebrated by   Vietnamese people around January or February.