Modal Verbs of Deduction

Match the modal MUST with its function

• To express 50% of certainty

• To express 100% of certainty

• Information that is impossible or not true

Match the modal CAN´T with its function

• 50% certain of the information

• 100% sure of the information

• Information that is impossible or not true

Match the modal MIGHT/MAY with its function

• Not true or impossible

• 100% Completely certain

• 50% - Maybe certain

Speaking to a coworker: "There are some dark clouds in the sky. It ...... later."

• must rain

• can't rain

• may rain

She ... live close to where she works because she walks to work.

• must

• may

• could

• might

My boss speaks Spanish perfectly. He ______ be from Spain or Latin America.

• must

• can't

• may

You’ve been working in the garden all day. You ... be tired.

• could

• may

• can't

• must

I don't like the sound of the engine. It ... be a mechanical problem.

• can't

• must

• might

• mustn't

It ... be a mechanical problem. I've just taken the car to a mechanic.

• must

• can't

• might

• may

He ... like that shirt. I don’t think it's his style.

• may not

• might

• must

• mustn't