1. The post office is behind my house.

2. Don't forget to do exercise before going to school.

3. Both Hoang and his brother are not fat.

4. Learning English is difficult.

5. Nam is the shortest one in my class.

6. Hung's friend is not as intelligent as him.

1. the post office is behind my house 

2. don't forget to do excercise before going to school 

3. both hoang and his brother are not fat 

4. learning english is difficult 

5. nam is the shortest one in my class 

6. hung's friend is not as intelligent as him 

     -answer by min-

p/s : vote và chọn ctlhn cho mình nhé >3