We ____________ write letters 50 years ago., could, couldn't, We _______________ talk on the phone 50 years ago., could, couldn't, We _______________ send emails 50 years ago., could, couldn't, I_____________________play tennis when I was 5 years old., could, couldn't, We ________________ watch TV 50 years ago., could, couldn't, My sisters_____________________run 15 km when they were 20 years old., could, couldn't, My grandma _________________ use the computer a month ago., could, couldn't, We _________________ send texts 50 years ago., could, couldn't

Could/couldn't

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更像是这样

Can - Can't / Could - Couldn't
Can - Can't / Could - Couldn't
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随堂测验
can/can't/could/couldn't
can/can't/could/couldn't
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随堂测验
can, can't, could, couldn't
can, can't, could, couldn't
由
随堂测验
Can, could, be able to (communication)
Can, could, be able to (communication)
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随机轮盘
Can/Can't/Could/Couldn't
Can/Can't/Could/Couldn't
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随堂测验
Could-Couldn't
Could-Couldn't
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句子排列
Can, can't, could, couldn't
Can, can't, could, couldn't
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随堂测验
Be able to/ can/ could
Be able to/ can/ could
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随堂测验

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