关于as引导的比较状语从句

He can operate the machine as well as I do.

这里，为什么用do？do后边不缺成分吗？感觉这里又很像定语从句中的as？这里as是比较状语从句中的连词吗？该如何解释？

陈才老师，不好意思，我又来挑刺了（这今后可能是我的日常工作）！

He can operate the machine as well as I do.

=He can operate the machine as well as I (can operate the machine).

你等号后面的句子在as well as I 后面是不能有 can 的，否则意思就会有所变化（即就不能划等号了）。我的理解是：

He can operate the machine as well as I do.

=He can operate the machine as well as I (operate the machine).

同样，在你的“备注(1)”中，“do=can operate the machine”中的can也应该去掉。注意：do 用于替代“动词原形”，但不用于替代“can+动词原形”。

温馨提示：非常欢迎陈才老师对我的解答提出质疑和挑刺！先谢谢了！

胡德忠 -

擅长：英语 | 采纳率 58% | 回答于 2022-10-20 20:21

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陈才 - 英语教师 2022-10-20 17:40

擅长：中考英语,词法问题

He can operate the machine as well as I do.

=He can operate the machine as well as I (can operate the machine)

备注(1)：do为替代词用法，替代和主句谓语相同内容，即do=can operate the machine。