Choose the correct modal verb for each gap to complete the friends' guesses about the mysterious birthday gift sitting on the table.
It rattles lightly when you shake it. It could be a board game, but I'm not entirely sure.
It is completely flat and bends easily. It can't be a new laptop because laptops are rigid and heavy!
Wait, the box has a "Live Animal" sticker and is meowing loudly. It must be the little kitten you asked for!
It rattles lightly when you shake it. It could be a board game, but I'm not entirely sure.
We use could to express a possibility when we are guessing but lack total certainty.
It is completely flat and bends easily. It can't be a new laptop because laptops are rigid and heavy!
We use can't for a strong negative deduction. The evidence (it bends) makes it impossible to be a laptop.
Wait, the box has a "Live Animal" sticker and is meowing loudly. It must be the little kitten you asked for!
We use must for a strong positive deduction. The clues (sticker and meowing) make it almost certain to be a kitten.