when和while在虽然这个意思上的区别

when 举例：He walks when he might take a taxi.这里的when 兼有时间和让步（although)的含义.翻译：他虽然可以乘出租车,却总是步行.
They have only three copies when we need five.尽管我们需要无本,但他们只有三本.
while 举例：while I understand what you say,I can't agree with you.尽管我理解你说的话,但是我不能同意你的建议.
while he has many friends,Peter is often lonely.尽管彼得有许多朋友,但常常感到孤独.
由上诉此可见,一般来说,when 做让步状语时,放于句中时候比较多,而while放于句首多.还有一种情况是,while 多用于书面正式文章中,而when 显得口语化.其实两者并无多大的区别.
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