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Should 应该;将要;可能;就短句:i should rather say no to the school bullying You should speak english in english class Maybe I should say sorry to her. Must 必须,一定;很可能;可以,应当短句: You must start the project from main idea. I must go to the office And now we must go, to the library.如果你说的是应该的话,我更建议你用第一个should,第二个must无论在语气上或用途上更显的肯定一点,一定要怎样怎样。