Ready for first unit 9 modals speculation and deduction

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Jack MAY HAVE / MAY taken the day off because he is not at his desk.

Jack MAY HAVE taken the day off because he is not at his desk.

They MUST / CAN'T be sleeping. It is already 1 o' clock in the morning.

They MUST be sleeping. It is already 1 o' clock in the morning.

Our teacher looked ill yesterday. She MAY HAVE NOT / MAY NOT HAVE been feeling good.

Our teacher looked ill yesterday. She MAY NOT HAVE been feeling good.

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