@ MUST I go to school?

If you see the red light in a traffic lights, YOU HAVE TO STOP!
With my students of 3º ESO we're are going to see the differences between MUST and HAVE TO, because in Spanish, the difference isn't as clear as English does it. Let's see a little more about this "verbs" in the following grammar explanation:

Differences between MUST and HAVE TO

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And now, some exercices:
ONE
TWO
THREE
FOUR