1.Was the machine invented by Bill?She wasn‘t sure.合并成一句话
1.Was the machine invented by Bill?She wasn‘t sure.合并成一句话
She wasn't sure__the machine___ ___ ___by Bill.
2.Last Sunday we heard them sing Peking Opera in the theater.改为被动语态
They ___ ___ ___ ___Peking Opera in the theater last Sunday.
She wasn't sure__the machine___ ___ ___by Bill.
2.Last Sunday we heard them sing Peking Opera in the theater.改为被动语态
They ___ ___ ___ ___Peking Opera in the theater last Sunday.
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She wasn't sure_that_the machine_had__ __been_ _invented__by Bill.因为that前面的主句是过去时,这个句子有是宾语从句,所以that后面的从句的时态也要是过去,原句是一般过去时（表示过去）,那么从句就要用过去完成时（表示过去的过去）
2.Last Sunday we heard them sing Peking Opera in the theater.改为被动语态
They _were__ __heard_ __to_ __sing_Peking Opera in the theater last Sunday.hear sing中省略了to,但是在被动句中这个to就要还原
2.Last Sunday we heard them sing Peking Opera in the theater.改为被动语态
They _were__ __heard_ __to_ __sing_Peking Opera in the theater last Sunday.hear sing中省略了to,但是在被动句中这个to就要还原
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