=>
VI/
1. The blue is not as expensive as the red shirt.
2. Primary schools are not as bigger as secondary schools.
3. Mary studies as well as Ann.
4. Smith drove more carelessly than Smith.
5. She learns English better than him.
6. He left the factory without taking anything.
7. This house is not as comfortable as the one we saw last month.
8. It's interesting to learn English.
9. He was too tired to feel asleep before the end of the film.
10. Elizabeth can't play the piano as well as Jane.

IV/
4. meet -> met
5. aren't -> weren't
6. forgot -> has forgotten
7. introduce -> introduced
8. worked -> has worked
9. than -> to

1. The blue is not as expensive as the red shirt.
2. Primary schools are not as bigger as secondary schools.
3. Mary studies as well as Ann.
4. Smith drove more carelessly than Smith.
5. She learns English better than him.
6. He left the factory without taking anything.
7. This house is not as comfortable as the one we saw last month.
8. It's interesting to learn English.
9. He was too tired to feel asleep before the end of the film.
10. Elizabeth can't play the piano as well as Jane.

IV/

1.could

2.used to

3.did
4. met
5. weren't
6. has forgotten
7. introduced
8. has worked
9. to

10.has