[ Past Modals ]
Your little brother failed a test. You say:
A. You could have studied.
B. You must studied.
C. “You should have studied. You shouldn’t have played video games all weekend.”

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Adverbs of DegreeHas and HaveWas and WereModal Verbs in ConditionalsNoun ClausesPast Simple & Past ContinuousWho vs WhomModal Verbs for Permission and ObligationModals - Reported Speech - ConditionalsPresent Simple Affirmative and NegativeOther quiz:
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I _______coffee now.
A. Am drinking
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C. drinking
D. drinks