新概念英语教师用书第1册第130课:他是售票员还是巴士司机？

T： Was he a conductor or a bus driver?

S： He can't have been a conductor. He must have been a bus driver.

T： Was she Chinese or Japanese?

S： She can't have been Chinese. She must have Japanese.

T： Were they listening to the stereo or watching television?

S： They can't have been listening to the stereo. They must have been watching television.

T： Now you answer the questions. Ready?

T： Was he a conductor or a bus driver?

S： He can't have been a conductor. He must have been a bus driver.

T： Was she Chinese or Japanese?

S： She can't have been Chinese. She must have Japanese.

T： Were they listening to the stereo or watching television?

S： They can't have been listening to the stereo. They must be watching television.

T： Was it the 24th or the 25th yesterday?

S： It can't have been the 24th. It must have been the 25th.

T： Were the English or American?

S： They can't have been English. They must have been American.

T： Was your pencil sharp or blunt?

S： It can't have been sharp. It must have been blunt.

T： Was she dusting the table or sweeping the floor.

S： She can't have been dusting the table. She must have been sweeping the floor.

T： Was he the oldest or the youngest in the family?

S： He can't have been the oldest. He must have been the youngest.

T： Was she 20 or 25?

S： She can't have been 20. She must have been 25.

T： Were they mechanics or engineers?

S： They can't have been mechanics. They must have been engineers.

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