What does this sign express: Obligation, prohibition, or permission?
Obligation (you must stop)
What does this sign express: Obligation, prohibition, or permission?
Obligation (you must slow down)
What does this sign express: Obligation, prohibition, or permission?
Obligation (you must only go this way)
What does this sign express: Obligation, prohibition, or permission?
Prohibition (you may not enter this way)
What does this sign express: Obligation, prohibition, or permission?
Permission (you may press this button for attention)
What does this sign express: Obligation, prohibition, or permission?
Prohibition (you may not cross the road)
What does this sign express: Obligation, prohibition, or permission?
Permission (you may cross the road)
What does this sign express: Obligation, prohibition, or permission?
Prohibition (no parking here)
What does this sign express: Obligation, prohibition, or permission?
Permission (you may come in)
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
Is this sentence correct? "You shouldn't to ride your bicycle in the rain."
Incorrect: "You shouldn't ride your bicycle in the rain"
Is this sentence correct? "They don't have to filling in the form unless they are coming on the excursion."
Incorrect: "They don't have to fill in the form unless they are coming on the excursion."
Is this sentence correct? "I'm need to wear a helmet when I'm riding on my skateboard."
Incorrect: "I need to wear a helmet when I'm riding on my skateboard."
