He couldn't answer this question just now.(改为同义句)He() () ()answer this question just now

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He couldn't answer this question just now.(改为同义句)He() () ()answer this question just now

He couldn't answer this question just now.(改为同义句)He() () ()answer this question just now
He couldn't answer this question just now.(改为同义句)He() () ()answer this question just now

He couldn't answer this question just now.(改为同义句)He() () ()answer this question just now
He (was) (unable) (to) answer this question just now.
刚才他无法回答这道问题.
couldn't——cannot的过去式,could not,意为能力所及之外,所以无法做成……事.
was unable to——unable为能力上不能做……事
was unable to=could not
希望我的回答能够帮得上您.

He was unable to answer this question just now
绝对正确,请放心
愿你学习进步!

喂!家庭作业都拿出来百度, 你也太懒了吧?!
人家回答得很好, 不过, 你自己也加加油.
爸妈网儿童英语

wasn't able to

He was unable to answer this question just now
(was) (unable) (to)
couldn't——cannot的过去式,could not,意为能力所及之外,所以无法做成……事。
was unable to——unable为能力上不能做……事
was unable to=could not