1:A letter is being written now (by her).
2:French and English are spoken in Canada.
3:That math can't be done by Nam.
4:Your clothes need to be washed.
5:This road have been repair (by them).
6:He is thought to be a singer.
7:He is said to steal this car.

Ex 2.
1. It is very useful to know English.
2. It has been snowing since 5 o' clock.
3. Hung is shorter than Nam.
4. what time did you go to bed last night?
5. Do you know what time/when Nam has to leave?

Ex2. Continous
6. It is good to do morning excercise.
7.This book is as boring as that one.
8. Shall I have to sleep under a net?
9. I haven't read a book since september 20th.
10. Ann has been interested in helthy eating for 3 years.