While的用法小结
【辨析】while, when, as表“当……的时候”的区别
while强调同时性或某时间段内一种情况发生时另一种情况出现,与延续性动词连用;when可与延续或非延续性动词连用,在强调“当时”,“这时”之意时when; as强调同时性,指“一边……一边……”一件事情发生,另一件事情立刻发生。
【即时应用】
①——I’m going to the post office.
——______you’re there, can you get me some stamps?
A. As
B. While
C. Because
D. If
解析:从该题的题意可以看出C、D两选项不合题意；而as侧重同时性,不合题意;while可指一时间段发生某情况时,另一情况出现,正合题意。
写出下列句子中while的含义：
②There’s plenty of rain in the southeast, while there's little in the northeast.( )
③While the discussion was still going on, George came in. ( )
④While I admit his good points I can see his bad. ( )
⑤He usually goes to work by bike, but once in a while he goes by bus. ( )
⑥We can surely overcome these difficulties while we are closely united. ( )
⑦While listening to the radio, she fell asleep. ( )
答案:②然而③当……的时候④虽然⑤一段时间⑥只要⑦当……的时候
