It’s possible that she is at home. (might) She _____ at home., She might be at home., It’s certain that he knows the answer. (must) He _____ the answer., He must know the answer., It’s possible that they are tired. (could) They _____ tired., They could be tired., It’s possible that the teacher is busy. (might) The teacher _____ busy., The teacher might be busy., It’s certain that this is the right address. (must) This _____ the right address., This must be the right address., It’s possible that he is sleeping. (might) He _____ sleeping., He might be sleeping., It’s certain that they are studying. (must) They _____ studying., They must be studying., It’s possible that she is talking to her boss. (could) She _____ talking to her boss., She could be talking to her boss., It’s possible that the baby is crying. (might) The baby _____ crying., The baby might be crying., It’s certain that they are arguing. (must) They _____ arguing., They must be arguing., It’s possible that he forgot the meeting. (might) He _____ the meeting., He might have forgotten the meeting., It’s certain that she took the keys. (must) She _____ the keys., She must have taken the keys., It’s possible that they missed the bus. (could) They _____ the bus., They could have missed the bus., It’s possible that he left early. (might) He _____ early., He might have left early., It’s certain that someone broke the window. (must) Someone _____ the window., Someone must have broken the window..

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