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HAVE TO / DON'T HAVE TO
MUST / MUSTN'T
MUST
HAVE TO
Structure: Subject + have to (tense) + verb s.form + c
Structure: Subject + Must + verb s.form + c
- We use have to in positive sentences.
- To express external obligations, when somebody else tells you what you have to do, on the contrary there will be consequences.
Ex: I have to get up early because I have a meeting with my boss.(You are expressing that if you don't get up early you will have bad consequences because of the important meeting)
- We use it in positive sentences.
1- To express internal obligations, tasks that you want to do because you think it's necessary to do it.
Ex: I must make my bed, it's very dirty (nobody asks you to make the bed, you think it's necessary to do it)
2- In laws or rules: We can also use "must" in places where something is settled down and you must comply with the rules.
Ex: You must bring your ID if you want to pass. (you need to bring your ID, it's a rule)
MUSTN'T
DON'T HAVE TO/DOESN'T HAVE TO
Structure: Subject+Don't have to + verb.s.form + C
Structure:Subject + Mustn't + verb.s.form + C
We use it in negative sentences.
- You use it to express that something is forbidden.
Ex: You mustn't smoke at the restaurant.
We use it in negative sentences.
- To say that something is optional to do, it isn't necesary to do if you don't want.
Ex: You don't have to pay anything , you can go to the concert, it's for free.
WE CAN USE HAVE TO /MUST TO EXPRESS STRONG RECOMMENDATIONS
- PARIS IS BEATIFUL, YOU HAVE TO GO THERE
- PARIS IS BEATIFUL, YOU MUST GO THERE