What does this sign express?
you must stop
What does this sign express?
you may not enter this way
What does this sign express?
you may not cross the road
What does this sign express?
Prohibition (you may not go faster than 40 mph) or Obligation (you must go slower than 40 mph)
What does this sign mean?
you may/can cross the road
What does this sign mean?
You mustn't park here
What does this sign mean?
You can't park around this sign
What does this sign express: Obligation, prohibition, or permission?
Permission (you may come in)
Complete the sentence: "You ____________ climb up the volcano today; there's smoke near the top."
shouldn't / mustn't / can’t / are not allowed to
Complete the sentence: "The door isn't locked, so you ________ come in any time you want."
can / may
Complete the sentence: "If you want to work at a construction site, you ___________ wear a hat and gloves."
must / have to / need to
Complete the sentence: "You __________ get water from that tap. It's not safe to drink!"
shouldn’t / mustn't / can't
Complete the sentence: "My best friend is in the hospital. I _______ go visit him to cheer him up."
should / ought to
Complete the sentence: "You ________ pay attention and take good notes in class so you can get a better grade."
should / ought to / must / need to / have to
Complete the sentence: "You ________ use a telescope to see the planet Mars in the sky, but it helps a lot."
needn't / don't need to / don't have to
