Your hands are dirty; you _____ wash them.
should
The school rules say that we _____ use our cell phones in the classroom.
must not/ mustn't
Phelps ___________ swim when he was born
couldn't
can't
can
could
Phelps couldn’t swim when he was born but he _________ swim really fast now.
could
can
can't
couldn't
Cats cam climb trees but elephants _________ do it.
couldn't
can't
could
can
When the traffic light is red, you ______ go on.
mustn't
don't have to
You _______ drink alcohol, you can have a soft drink.
don't have to
mustn't
Visitors __________ smoke.
don't have to
mustn't
He _____ use a laptop, he doesn't know how.
can't
can
You ______ be careful with knives.
don't have to
must
If you like, you _____ use my computer.
can
have to
John ______ play video games; he doesn't have a computer.
can't
couldn't
You _____recycle old appliances.
must not
should
You ____ touch electric sockets with wet hands.
must not
don't have to
You _______ turn off your cell phones during the test.
must
should
must not
shouldn't
“You don’t look well. You _______ see a doctor.”
must not
shouldn't
should
must
