Ex a
2 might have broken / 3 must have left / 4 must have put / 5 can't have drunk / 6 might not have seen / 7 must have worked / 8 can't have finished / 9 might not have been able to get / might not have got / 10 must have switched off
Ex b
2 shouldn't have used / 3 should have broken up / 4 should have come / 5 should have waited / 6 should have kept / 7 should have told / 8 shouldn't have worn
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