1. It is wrong of us to throw rubbish.
-> We musn't throw rubbish.
2.It is not good to stay up so late to listen to music.
-> You should go to bed early.
3. It is essential that you do your homework before going to school.
-> You musn't do not do homework before class
4. You look so thin. It’s necessary to eat much to gain your weight.
=> You should eat much to gain your weight
5. It is essential that you close the door before going out.
=> You must close the door before going out
6. It's not allowed to park here.
=> You mustn’t park here