would you please look after my dog ____i am out为什么不能用if,而要用while

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would you please look after my dog ____i am out为什么不能用if,而要用while
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would you please look after my dog ____i am out为什么不能用if,而要用while
would you please look after my dog ____i am out
为什么不能用if,而要用while

would you please look after my dog ____i am out为什么不能用if,而要用while
while是指当什么时候
意思是当我出去的时候你能帮我照看一下我的狗么?
而if 是如果的意思.
不符合题意.

while表示当我不外出的时候,更接近于说话的习惯.
而if好像说起来挺别扭的.

我觉得也可以用if

意思是：当我离开的时候，你愿意照看我的狗吗？
while表示的是 当……时

when也可以吧

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