Ben learned to walk when he was about one year old.对划线部分提问划线部分是wh_英语解答

Ben learned to walk when he was about one year old.对划线部分提问
划线部分是when he was about one year old
When did Ben learn to walk?为什么用did?

人气：358 ℃　时间：2020-05-20 19:34:16

解答

When did Ben learn to walk?
因为原句的时间状语是was,所以疑问句也要用相同的时态为什么不用When was呢?因为learntowalk是动词，所以要借助助动词来提问，而不是用be 动词