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Modal verbs for obligation and permission
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You mustn't / don't need to wear a suit if you don't want to.
You don't need to wear a suit if you don't want to.
Oops!
Okay!
A rock musician has to / doesn't have to shave every morning.
A rock musician doesn't have to shave every morning.
Oops!
Okay!
Can you / Do you have to do your homework now? I need your help.
Do you have to do your homework now? I need your help
Oops!
Okay!
I must / mustn't forget to phone John this afternoon.
I mustn't forget to phone John this afternoon.
Oops!
Okay!
Can you / Do you have to call your brother now? I want to ask him a question.
Can you call your brother now? I want to ask him a question.
Oops!
Okay!
You need to / don't have to wear special clothes – it's obligatory.
You need to wear special clothes – it's obligatory.
Oops!
Okay!
You can / can't wait for me here – I'll be right back.
You can wait for me here – I'll be right back.
Oops!
Okay!
We need to / needn't tell your father about it – it will be our secret.
We needn't tell your father about it – it will be our secret.
Oops!
Okay!
I must / mustn't remember to take my laptop to school tomorrow.
I must remember to take my laptop to school tomorrow.
Oops!
Okay!
We need to / needn't hurry up – we're late.
We need to hurry up – we're late.
Oops!
Okay!
He mustn't / doesn't have to wear suits every day but he likes smart clothes.
He doesn't have to wear suits every day but he likes smart clothes
Oops!
Okay!
I'm sorry but you can / can't park here.
I'm sorry but you can't park here.
Oops!
Okay!
A tourist guide has to / doesn't have to find solutions to problems quickly.
A tourist guide has to find solutions to problems quickly
Oops!
Okay!
You don't have to / mustn't pay to visit the museum – it's free for students.
You don't have to pay to visit the museum – it's free for students.
Oops!
Okay!
You mustn't / don't have to leave now – the class hasn't finished yet.
You mustn't leave now – the class hasn't finished yet.
Oops!
Okay!
You mustn't / have to eat or drink in the library.
You mustn't eat or drink in the library.
Oops!
Okay!
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