1. The old house on the plateau that we visited was magnificent.
2. Nam's speaking skill has to be improved during the second sêmster by him.
3. If we weren't busy painting the windows, we could join the trip.
4. Lan was unhappy because she failed her math test.
5. Henry plays guitar better than him.
6. The artisan moulded the copper so that he could make a bronze drum.
7. If i lived in a big city, i could go to the cinema very often.
8. I wish i could help you then.
9. Your work must be planned carefully.
11. Tom asked Mary if he could borrow her calculator.