Modals of deduction: must, can't, might/ may/ could

You're not wearing a coat. You _______ be cold.

• must

• could

• can't

I don't believe I got 100% on the quiz. That _______ be true.

• must

• could

• can't

Rewrite this sentence: You are great at skiing. Maybe you'll be really good at snowboarding.

It's possible John is working on something new. He ______ be writing a novel.

• must

• may

• can't

Rewrite the sentence: It's after six. It's possible they are at home now.

I'm almost certain I know the answer. It ______ be 134!

• must

• could

• might

Frank just left home two minutes ago. He ______

• must

• may

• can't

The phone's ringing. I'm not sure, but it _______ be your mother.

• must

• might

• can't

Rewrite the sentence: You're joking. I'm sure you're not serious.

Which option is the correct one?

• You must to be hungry.

• You must be hungry.