I can't decide to buy which one,

问题描述：

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习惯用法是 I can't decide which one to buy !

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I can't decide which one to buy.

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有！应该是I can't decide which one to buy 。which要调上来。

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有!I can't decide which one to buy. 才对!

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I can't decide which one should i buy.
or
I can't decide which one to buy.

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I cannot decide which one to buy 比较好一点把?

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如果说i can't decide to buy...后面最好跟一件确定的物品.如：i can't decide to buy this car.
你的说法可以换成：I can't decide on which one to buy.

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饿。。原则上似乎没有错。
不过I can't decide which one to buy 比较好