Modal verbs for obligation, prohibition and advice: must, have to, ought to, should

1 Complete the text using the correct forms of the words.

Hi! I’m Harry and my school is organising a camping trip soon for all the students. We ___ get permission from our parents first, of course, before we can go.

I’m not sure if I _____ go or not.

My parents have said I ______ if I don’t want to. 

But I guess I _____ just stay at home and miss all the fun! 

We’ll ______ take our own clothes to wear.

But luckily we ____ take tents, because they’re provided. It's up to us.

I ______ remember to take a warm jacket, though, as it will be chilly.

And the teachers have said we ______ take our mobile phones in case they get lost! It’s not allowed! 

2 Complete the second sentence so that it means the same as the first.

Don’t talk in the library! It’s not permitted.

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You ___ talk in the library. 

There’s no school tomorrow, because it’s a school holiday.

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We _____ go to school tomorrow, because it’s a holiday.

My coach has advised me to try and go to football practice twice a week, if I can.

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I _____ to go to football practice twice a week, if I can. 

Please remind me to post this letter!

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I ____ forget to post this letter

If we don’t run for the bus, we’ll miss it!

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We’ll _____ run for the bus!

It’s a weekday, so my brother shouldn’t be at home now.

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It’s a weekday, so my brother ____ to be at work now.

Do come and see our new puppy – he’s wonderful!

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You ____come and see our new puppy! 

I’ve done a lot of maths practice, so I don’t think I need to work too hard for next week’s test.

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I ____ need to work too hard for next week’s test. 

It’s not allowed to take photos here.

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You ______ take photos here.

It’s not necessary to run.

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We’ve got time. We ____ run.

I don’t think it’s a good idea to eat lots of chocolate before dinner.

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You ____ eat lots of chocolate before dinner.

It’s a good idea to see the doctor about your injured leg, I think.

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I think you ____ to see a doctor about your injured leg.