I didn't hear you come in last night. - I must have been asleep., I couldn't sleep last night. - I shouldn't have slept so much on Sunday., I didn't receive your email. - You must have sent it to the wrong address., I didn't know we were running out of butter. - I could have bought some on my way back home., I shouldn't have drunk so much in the after-office party. - I have a terrible headache., We shouldn't have promised to finish the report for this Friday. - We won't have enough time to do it., Sarah could have passed the exam - if she had studied a bit more., Sarah can pass the exam - if she studies a bit more., Peter can't have arrived so early at the office. - He was the last one to leave the after-office party the night before., Peter has not arrived at the office yet. - He might have overslept.,

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