bai1: 1.Hung's brother doesn't drive as carefully as hung

2.The laboratory in my school  some years ago was badly equipped than now

3.Quang works harder so he oftens gets better marks than Nam

4.Trung doesn't drive as carelessly as Minh so he has rarely had an accident

5.Going by bus is slower than going by taxi but it costs less than a taxi

bai 2:

1.Last summer  I went to the beach less than this summer

2.That cake is less freshly made than this cake

3.His younger brother behaves less politely than Jim

4.In the past teenagers act less violently than these day

5.My mother is less patient than your mother