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。备注(2):括号里内容要么全部省略,要么用替代词do替换。备注(3):as引导比较状语从句,并在比较状语从句作方式状语。备注(4):第1个as为副词修饰副词well表示程度,第2个as为连词引导比较状语从句。