ESL BLUE(s) must (not), (don't) have to

This is a park sign. It shows a man and a dog. The man is dropping a bag in the garbage can. The bag contains the dog's poop (waste). It is illegal to leave dog poop in the park. You must pick it up. Click here to see the troubleshooting page and here to see the rules.

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  1. You ___ respect the rules when you walk your dog in this park.
    a) must
    b) must not
    c) have to
    d) don't have to

    (Click on arrow to see correct response. Click on response to keep it visible.)
  2. Before you enter the park, you ___ attach a leash to your dog's neck.
    a) must
    b) must not
    c) have to
    d) don't have to

  3. You ___ enter the park until your dog is on a leash.
    a) must
    b) must not
    c) have to
    d) don't have to

  4. You ___ allow your dog to run free.
    a) must
    b) must not
    c) have to
    d) don't have to

  5. You ___ pick up your dog's poop (waste).
    a) must
    b) must not
    c) have to
    d) don't have to

  6. You ___ take it away with you. You can throw it in one of the garbage cans you find in the park.
    a) must
    b) must not
    c) have to
    d) don't have to

  7. If your dog is running free and the police stop you, you will probably ___ pay a fine.
    a) must
    b) must not
    c) have to
    d) don't have to

  8. Of course, you ___ walk your dog in the park. You can always go somewhere else. There are many places where you can walk a dog.
    a) must
    b) must not
    c) have to
    d) don't have to

  9. You can, for example, walk your dog in the fields or on the beach, but even there you may ___ use a dog leash.
    a) must
    b) must not
    c) have to
    d) don't have to

  10. Many people have had bad experiences with dogs and are afraid of them. You ___ forget that fact when you walk your dog in public.
    a) must
    b) must not
    c) have to
    d) don't have to

In the affirmative have to / must both express the idea of obligation.
(It is necessary that you do something.)
However, must is only used in the present, and is never used after 'will' or 'may.'
I must / have to get up early because I start work at 8 a.m.
I will must / have to leave work early if the snowstorm continues.
In the negative only the verb have to (do/does not have to) expresses the idea of obligation:
(It is not necessary that you do something.)
You don't have to pay for children. They can come in for free.
In the negative must (must not / mustn't) is similar to an imperative: Do not do something:You mustn't smoke in the corridors. (= Don't smoke in the corridors.)

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