Keep the sun behind you when you take a photowhen后的take为什么不用doing形式

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Keepthesunbehindyouwhenyoutakeaphotowhen后的take为什么不用doing形式Keepthesunbehindyouwhenyoutakeaphotowhen后的

Keep the sun behind you when you take a photowhen后的take为什么不用doing形式
Keep the sun behind you when you take a photo
when后的take为什么不用doing形式

Keep the sun behind you when you take a photowhen后的take为什么不用doing形式
因为这里when后面是完整的句子.
Keep the sun behind you when you take a photo和Keep the sun behind you when taking a photo的意思是一致的,如果没有you这个主语在就要用doing形式.

因为他有主语you,是个句子

如果前面的 Keep 用了Keeping,后面的take也就可以用taking了。
Keeping the sun behind you when you're taking a photo.

祈使句+when+一般现在时
所以用take而不是taking,而且take 是瞬间动词,不能用taking