I’m sure Ryan forgot about our appointment because he usually writes everything in his calendar. (must), Ryan must have forgotten about our appointment because he usually writes everything in his calendar., Perhaps Anna left her phone in the taxi when she was coming home. (might), Anna might have left her phone in the taxi when she was coming home., I’m certain Ben didn’t take the documents because they were still on my desk when he left. (can’t), Ben can’t have taken the documents because they were still on my desk when he left., We expected the train to arrive twenty minutes ago. (should), The train should have arrived twenty minutes ago., Perhaps they misunderstood the instructions because they completed the wrong task. (may), They may have misunderstood the instructions because they completed the wrong task., It is impossible that Chloe wrote this report because she was on holiday all week. (couldn’t), Chloe couldn’t have written this report because she was on holiday all week., I’m sure the thief entered the house through the kitchen window because it was broken. (must), The thief must have entered the house through the kitchen window because it was broken., We expected the parcel to be delivered by Friday. (should), The parcel should have been delivered by Friday., Perhaps the driver didn’t see the road sign because it was hidden behind a tree. (might not), The driver might not have seen the road sign because it was hidden behind a tree., I’m sure Julia spent all her money during the holiday because she couldn’t even pay for a taxi home. (must), Julia must have spent all her money during the holiday because she couldn’t even pay for a taxi home., It is impossible that the children broke the vase because they weren’t at home. (can’t), The children can’t have broken the vase because they weren’t at home., We expected the doctor to call us with the test results before lunchtime. (should), The doctor should have called us with the test results before lunchtime., Perhaps Peter chose a different route because the main road was closed. (may), Peter may have chosen a different route because the main road was closed., I’m sure the neighbours heard the loud noise because their windows were open. (must), The neighbours must have heard the loud noise because their windows were open., It is impossible that Mark was at the party last night because he was abroad. (couldn’t), Mark couldn’t have been at the party last night because he was abroad.

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