This worksheet can be used to practice modals to express degrees of certainty (Present or past). Example: The lights could have been caused by a storm or Aliens might try to communicate with us. It also gives students the opportunity to express opinions using 'should'. Example: You sholudn't lend expensive things to your friends or You sholudn't have lent your computer to your friend.
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Degrees of Certainty in Past Modals
Past Modals Worksheet
It Can Be Done! How to Teach Modals in the Passive Voice