‘It's not necessary to book a hotel; you can stay in our spare room.' You mu s tn’t / don’t have to stay in a hotel.
‘It’s not necessary to come to the train station to meet me.' You have to / don’t have to meet her at the train station.
All passengers must fasten their seatbelts.
They can fasten their seatbelts.
They don’t have to fasten their seatbelts.
They have to fasten their seatbelts now.
‘In my country, you can carry your passport with you if you want, but it's not necessary.' In her country, you don’t need to / mu s tn’t carry your passport with you.
‘Smoking isn't allowed in the airport.’ You mu s tn ’t / don’t have to smoke in the airport.
You don't need to buy me a birthday present.
You mustn't buy me a birthday present
It’s not necessary to buy me a birthday present.
You must buy me a birthday present.
We have to pay the electricity bill before Friday.
We can pay it if we want to.
We've already paid it.
We must pay it.
I have to do some work on my project this evening.
I need to do the work.
i haven't got time to do the work.
I've already done the work.
Students mustn't run in school buildings.
Running isn't allowed.
They can run if they want to.
Students don't like running.
It's kind of you to offer to help, but you really don't need to.
Your help isn't necessary.
I don't want you to help me.
You won't be able to help me.
‘The instructions tell you to write in pencil.' You must / n e ed n ’t write in pencil.
‘You can contact us by either phone or e-mail.' You mu s tn’t / don’t have to phone them.
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