"i am going to the post office" "_you are there ,can you get me stamps?"为什么选while,不选as ,if

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"i am going to the post office" "_you are there ,can you get me stamps?"为什么选while,不选as ,if
"i am going to the post office" "_you are there ,can you get me stamps?"
为什么选while,不选as ,if

"i am going to the post office" "_you are there ,can you get me stamps?"为什么选while,不选as ,if
“当什么时候”的意思,if是如果,as常引导原因状语从句.欢迎追问

while 表当什么的时候