couldn't 同义句为什么要变过去式
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couldn't 同义句为什么要变过去式
用适当的动词和情态动词填空 They couldn't find any secrets.=They ( )not( )to find any secrets.
was able
问:1.为什么不是were,able
2.能否是are ,able?抑或因为could 是can 的过去式,所以词形转换必须过去时?
用适当的动词和情态动词填空 They couldn't find any secrets.=They ( )not( )to find any secrets.
was able
问:1.为什么不是were,able
2.能否是are ,able?抑或因为could 是can 的过去式,所以词形转换必须过去时?
![couldn't 同义句为什么要变过去式](/uploads/image/z/12062071-55-1.jpg?t=couldn%27t+%E5%90%8C%E4%B9%89%E5%8F%A5%E4%B8%BA%E4%BB%80%E4%B9%88%E8%A6%81%E5%8F%98%E8%BF%87%E5%8E%BB%E5%BC%8F)
could不光是Can的过去式,单独使用表示用于假设语气的条件句
再问: 用适当的动词和情态动词填空 They couldn't find any secrets. =They ( )not( )to find any secrets. 答案:was ,able 问:1.为什么不是were,able 2.能否是are ,able?抑或因为could 是can 的过去式,所以词形转换必须过去时?
再答: 1,应该用were , able, they是复数,用was怎么看也不对 2,不能用are,able,就是因为是用了过去式
再问: 用适当的动词和情态动词填空 They couldn't find any secrets. =They ( )not( )to find any secrets. 答案:was ,able 问:1.为什么不是were,able 2.能否是are ,able?抑或因为could 是can 的过去式,所以词形转换必须过去时?
再答: 1,应该用were , able, they是复数,用was怎么看也不对 2,不能用are,able,就是因为是用了过去式
couldn't 同义句为什么要变过去式
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