1 Can you help me with Physics?
Are you willing to help me with Physics?
2 She wants to become/be a doctor in the future, to save/help those in need.
3 One of the teachers come from America.
4 The girl with long hair is the shortest in their class.
5 Be careful, don't knock my cup down to the ground!
6 It is impolite to talk about someone behind their back.
It is impolite to talk bad of someone behind their back.
It is impolite to speak ill of others.
都是自己翻译的~ 希望可以帮到你!