1.be good for 对...有好处
be good at sth doing sth 擅长于
be good to sb 对某人友好 等同于be friendly to sb
2.in front of 和in the front of 都表示在...的前面,如果有定冠词表示 在某一范围内.in front就是表示在前面.
e.g.He stands in the front of the class.
His car is in front of road.
His desk in front.
3.each 表示每一个,是代词也是限定词.
e.g.Each of the answers is 5 points.
Each answer is right.
other表示其他的,既是代词也是形容词.
Do you have other questions?
This one is better than others.
cannot是can否定形式,表示不能够做某事.
He can swim.
He cannot swim.
希望对你有用.