strong deduction, The classroom lights are still on. The students must have forgotten to turn them off., She arrived late and looked stressed. She must have missed the earlier bus., The road is completely flooded. It must have rained heavily last night., Impossible, He can’t have finished the project already; he only started this morning., They cannot have understood the instructions because their answers were completely wrong., She can’t have seen my message yet because it was sent only a minute ago., possible explanation, She might have forgotten about the meeting today., They might have taken a different route to avoid traffic., He might have left his phone at home., possible explanation / ability, They could have completed the task earlier if they worked together., She could have misunderstood the instructions., He could have sent the email to the wrong person., regret / criticism, I should have studied more for the exam., You should have checked your answers before submitting the test., We should have left earlier to avoid the traffic., bad decision / criticism, I shouldn’t have stayed up so late last night., He shouldn’t have ignored the teacher’s advice., They shouldn’t have spent so much money.

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