第1个回答 2011-12-06
只有其意思是“当....时”,三词之间才有可比较的意义。
as其中之一的意思是;在....(同)时(at the same time that),表示某一个动作的时间点。如,I slipped on the ice as I ran home...
when意思为“当...时候,在那个时候”(at the time, during the time at==while),表示在某一个时间段或者是一个习惯性、自然的时间内。如,when i was young, I studied music.
while可表示when、as的意思,“....的时候”。如,I met her while(as/when) I was at school。while还可以表示虚拟事实“同时、与此同时“的意思,While the grandparents love the children, they are strict with them。