whd313
"Should" is most commonly used to make recommendations or give advice. It can also be used to express obligation as well as expectation.Examples: When you go to Berlin, you should visit the palaces in Potsdam. recommendation You should focus more on your family and less on work. advice I really should be in the office by 7:00 AM. obligation By now, they should already be in Dubai. expectation
"Must" is most commonly used to express certainty. It can also be used to express necessity or strong recommendation, although native speakers prefer the more flexible form "have to." "Must not" can be used to prohibit actions, but this sounds very severe; speakers prefer to use softer modal verbs such as "should not" or "ought not" to dissuade rather than prohibit.Examples: This must be the right address! certainty Students must pass an entrance examination to study at this school. necessity You must take some medicine for that cough. strong recommendation Jenny, you must not play in the street! prohibition
When you go to Berlin, you should visit the palaces in Potsdam. recommendation
You should focus more on your family and less on work. advice
I really should be in the office by 7:00 AM. obligation
By now, they should already be in Dubai. expectation
"Must" is most commonly used to express certainty. It can also be used to express necessity or strong recommendation, although native speakers prefer the more flexible form "have to." "Must not" can be used to prohibit actions, but this sounds very severe; speakers prefer to use softer modal verbs such as "should not" or "ought not" to dissuade rather than prohibit.Examples:
This must be the right address! certainty
Students must pass an entrance examination to study at this school. necessity
You must take some medicine for that cough. strong recommendation
Jenny, you must not play in the street! prohibition