do not &don't；can not &cannot&can't 区别是什么?

cannot,can not ,can`t区别 cann't,cannot,can't,can not有什么区别 don't 和 do not、can't 和cannot 哪些词语气更重? can`t cannot can not有没有区别 do not 和 can't的区别 I don't speak English和I can't speak Englis can not和cannot的区别是什么? can't与can not,cannot在情感上有什么区别? cannot和can not和can't一样吗?有什么区别! cannot与can not区别 can't与cannot的区别是什么? Don't read___books____you can not understand don't和do not的区别