1.The boy is all wet in the rain ,but his mother wasn't angry.
angry是形容词,应该用Be 动词修饰
2.John nevre greets teachers,so he is an impolite boy.
polite 的反义词是impolite,而不是unpolite
3.Don't make so much noise ,I feel quite uncomfortable.
此处应该用noise的名词noise,而不是形容词noisy,做make 的宾语
4.We were watching TV last night while my mother was doing the housework.
从句缺少 Be动词
5.He does not do his homework as carefully as you.
一般地,be not ...as..as..
6.Kitty does not look so healthy as Nancy.
同上
7.Don't worry .There is much time left.
根据句意,此处应该是积极的意思,还剩下很多时间much time,而不是所剩无几little time