关于英语现在完成时方面的.Having turned off the TV set,he began to go over his lessons.=After turning off the TV set,he began to go over his lessons.第一句话为什么用having done?动作是在began之前不是应该用过去完成时吗?是不是由于在句首的原因?可我还是不懂为什么用having turned,明白人讲一下.
问题描述：
关于英语现在完成时方面的.
Having turned off the TV set,he began to go over his lessons.=After turning off the TV set,he began to go over his lessons.
第一句话为什么用having done?动作是在began之前不是应该用过去完成时吗?是不是由于在句首的原因?可我还是不懂为什么用having turned,明白人讲一下.
答
having done,是独立主格结构,做状语.
如果不用having done,这句子就出现两个动词,不符合英语语法.