11. I'm sure that noise isn't a plane. = "That noise ______ a plane."
must be
may be
can’t be
might be
12. I'm sure you know a lot of people here. = "You ______ a lot of people here."
can’t know
may knowing
might knowing
must know
13. I'm sure Carl ate all the cookies. = "Carl ______ all the cookies."
might eats
must eating
must have eaten
can’t eat
14. It's possible Anima didn't tell the truth. = "Anima ______ the truth."
must told
might not have told
may has tell
can’t tell
15. I'm sure you're joking! = "You ______!"
may joking
can’t be joke
must jokes
must be joking
16. Maybe they're planning a surprise party! = "They ______ a surprise party!"
may planned
might be planning
can’t be plan
must planning
17. I'm sure she hasn't cleaned the bathroom. = "She ______ the bathroom."
may have cleaned
can't have cleaned
might cleaning
couldn't have cleaned
18. I'm sure they aren't talking about us. = "They ______ about us."
must be talked
may talking
might talks
can’t be talking
19. Perhaps Sam didn't see you. = "Sam ______ you."
can’t seen
may sees
must not saw
might not have seen
20. I'm sure they're wondering where we are. = "They ______ where we are."
may wondered
can’t wonder
might wonders
must be wondering
1. She looks tired. She ______ to bed late last night.
must have gone
may goes
might go
can’t go
2. I think he ______ be the new student. I’ve never seen him before.
might
couldn't
can’t
must
3. That ______ be Anna. She’s on her vacation in Japan right now!
may
must
can’t
might
4. The lights are on. Someone ______ be at home.
goes to
may not
must
can’t
5. They’re laughing a lot. They ______ be having fun.
may not
can’t
must
have
6. It’s very cloudy. It ______ rain later.
might
can’t
should
couldn't
