You should order the steak! It's really good here.
Should
Should expresses what the speaker thinks is the right or best thing to do. It is often used when giving advice:
I should quit.
You should study more.
They should be careful.
You shouldn't do that.
It is also used to ask for help or advice:
What should I do?
What time should I wake up tomorrow?
How long should I cook the chicken?
We often use should with "I think..." and "I don't think...":
I think you should buy that shirt.
I don't think you should do that.
I think we should get some pizza.
We don't think you should go.
Must
Must and mustn't are used to express an obligation (something you have to/need to do). It is much stronger than should:
You must try harder.
We must hurry!
You mustn't do that!
Must is often used by people in authority:
You must move your car.
(Police Officer)
You mustn't smoke.
(Doctor)
You must study more.
(Teacher)
Mustn't can be used to say that something is not okay to do:
- You mustn't take photos.
(It's not okay to take photos.) - She mustn't come late.
(It's not okay for her to come late.)
If you want to suggest something to someone or give them strong advice, you can use must:
You really must see that movie!
(Because I loved the movie so much!)
You must eat at that restaurant sometime!
(Because the restaurant was amazing!)
Must is not usually used in questions. For questions, use have to (Grammar 8-3).
Exercise
Open the exercise to begin the activity. Follow the instructions in the document.