The world has never seen popuation ageing before.请问　ageing的词性?1.　请问ageing的词性?为什么age+ing的时候,e不去掉呢?2.　这句话是现在完成时吗?　是不是看到　before　要用现在完成时?另外再问一个句

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Theworldhasneverseenpopuationageingbefore.请问　ageing的词性?1.　请问ageing的词性?为什么age+ing的时候,e不去掉呢?2.　这句话是现在完

The world has never seen popuation ageing before.请问　ageing的词性?1.　请问ageing的词性?为什么age+ing的时候,e不去掉呢?2.　这句话是现在完成时吗?　是不是看到　before　要用现在完成时?另外再问一个句
The world has never seen popuation ageing before.请问　ageing的词性?
1.　请问ageing的词性?为什么age+ing的时候,e不去掉呢?
2.　这句话是现在完成时吗?　是不是看到　before　要用现在完成时?
另外再问一个句子：　Until the early 1990s nobody much thought about whole populations (getting ) older.
这里为什么要用getting?是省略了　whole populations （are） getting older　吗？表示正在进行吗？　这种是什么用法？

The world has never seen popuation ageing before.请问　ageing的词性?1.　请问ageing的词性?为什么age+ing的时候,e不去掉呢?2.　这句话是现在完成时吗?　是不是看到　before　要用现在完成时?另外再问一个句
1 这里ageing是现在分词,可以理解为动词词性（be doing 中的doing是动词 be是助动词 be doing一起算是一个动词） ageing的有e的道理可以类比be的现在分词being,究其原因,其实很简单 aging 和ageing的读音不同,就像being跟bing的读音会不同一样,英国人也不希望一个动词变成现在分词或者动名词以后读音变了,如果变了就会让人难以理解别人说的话 对吧~~
2 这句话的结构可以参照see sb/sth doing sth 缩句成为 The world see population ageing.这里ageing是变老的意思.整句意思是,世界从未如此（严重的）老龄化过. before跟完成时并不是一一对应的,但是是常用的一个象征性的词,before 是过去的意思,逻辑上就会产生“过去”“现在”的对比,所以经常会引导完成时.
希望您能满意!

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