Correct use of 'must' and 'should'
Danny has seen the film Meet the Fockers 10 times. He thinks it is the funniest film ever and he is always telling his friends that they must see it. 'You must see Meet the Fockers. It's brilliant!' he says whenever he gets the chance.
Lucy has also seen Meet the Fockers 10 times and she, too, thinks it is the funniest film ever made. She tells her friends that they should see the movie. 'You should see Meet the Fockers. It's brilliant!' she says whenever she talks about movies with her friends.
Danny says 'You must see' and Lucy says 'You should see' when both of them are telling their friends to do the same thing. What's the difference between must and should?
Both these words are simple to use correctly. Must is used when you are giving a firm order to someone. You must get up at seven tomorrow. That is an order and the person you are talking to does not have a choice in the matter.
Must is also used when you are making a strong suggestion. It is your strong opinion that this is the right thing for the person to do. You must apologise to your mum tomorrow.
Should is used for less firm suggestions and advice. It is not as strong as saying must. You should get up at seven tomorrow. This would be the best thing to do but no lives will be lost if it does not happen.