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Past modals – Exercise 353
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Past modals — making
Modal = should / could / might / must / would
positive
modal + have + past participle
# He must have overslept.
negative
modal + not + have + past participle
# You wouldn't have believed me.
question
modal + subject + have + past participle
# Should I have warned them?
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You can continue this exercise later on from the point where you stopped.