1. Hung's brother doesn't drive more carefully than him
2. Some years ago the laborary in my school is worse than now
3. Quang works hard, so he oftens gets better marks than Quang
4. Minh drives more carelessly than Trung so he oftens has offten had an acccident
5. Going by bus is more slowly than going by taxi but it costs less than a taxi

1. Hung's brother doesn't drive as carefully as Hung.
2. Some years ago the laboratory is badly equipped than now.
3. Quang works more hard so he often gets better marks than Nam.
4. Minh drives more carelessly than Trung so has had some accidents.
5. Going by bus is slower than going by taxi but it costs less than a taxi

1. Hung's brother doesn't drive more carefully than him
2. Some years ago the laborary in my school is worse than now
3. Quang works hard, so he oftens gets better marks than Quang
4. Minh drives more carelessly than Trung so he oftens has offten had an acccident
5. Going by bus is more slowly than going by taxi but it costs less than a taxi