while until when的区别

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while until when的区别
while until when的区别

while until when的区别
while and when is similar in expression.sometimes "while" covers a longer time frame,"when" covers only short time frame.until typically can't subsititute for either while or when.examples:
1.While I am in town,can we schedule a lunch meeting please?(meaning,I shall be in town for a couple of days,we can meet any time during the 2 day period).
2.When I am in town,can we schedule a lunch meeting please?(Same meaning)
3.Jimmy is playing guitar while Jenny is singing (meaning Jimmy and Jenny are doing things at the same time).(you can use when if you wnat to).
4.Six libraries serve the city well enough,while nine libraries suit better for the surrounding countryside.(can't use when,because it describes a long term action)
5.The baby always cries whenever he is hungry.(can't use while)
6.Don't leave until the next shift comes.(can't use when or while).(one action after another,not the same time).
Good luck.