Modal Verbs of Deduction

X: Who is at the door?

Y: It ________ be your neighbour.

X: But he doesn't come home until 5 o'clock.

• can

• can't

• might

• must

X: So it ________ be your neighbour.

Y: He's still at work.

• can't

• must

• may

• might not

X: Hmm...it ________ be my sister.

Y: No. She told me that she won't be back home till tomorrow.

• may not

• cannot

• might

• must

X: I know! It ________ be the babysitter. I told her to come over in 10 minutes.

• must

• might

• may

• mustn't

X: It's only 13 degrees this morning.

Y: ________ there is frost outside?

• Might

• Can't be

• Maybe

• Do you think

X: Don't be silly! It needs to be at least 0 degrees outside.

Y: There ________ be frost on the Peak.

• must

• might

• can't

• do you think

X: You ________ be serious. I'm sure it will be cold and windy up there, but frost?!

• may

• must

• can't

• mustn't

Y: You probably think that I ________ be a fool to believe that the Peak has frost. Well, I'll prove it to you!

• must

• might

• cannot

• can't

X: All right, I'll make you a bet. If there is frost on the Peak, then I will have a ________ kick my bum in front of the school.

• Sherk

• donkey

• dragon

• princess

Y: Deal! And if I lose, I'll do the same.

X: Hey! Where are you going? You can't get frost from the freezer! ________ I was born yesterday?!

• Do you think

• (no change)