过去分词作状语问题Having been suffered such heavy pollutin already,it may now be too late to clean up the river.Having been told many times ,he still couldn't understand.为什么第一句要去掉been 第二句不用?
问题描述：
过去分词作状语问题
Having been suffered such heavy pollutin already,it may now be too late to clean up the river.
Having been told many times ,he still couldn't understand.
为什么第一句要去掉been 第二句不用?
答
第一句是主动语态,主语是河,经受了如此严重的污染,现在治理这条河流太晚了
第二句是被动语态,虽然被讲解了很多次,他还是不懂