1.I can't decide which one to buy能不能变成I can‘t decide to buy

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1.I can't decide which one to buy能不能变成I can‘t decide to buy which .
2.还有 decide which one to buy 这句中 dicide 后为什么没有on ,which后面的one能否省略.3.wh—+动词不定式这个到底是什么词性?从句?名词?什么从句?

1.I can't decide which one to buy不能变成I can‘t decide to buy which .这是带疑问词的不定式作宾语相当于一个宾语从句
2.还有 decide which one to buy 这句中 dicide 后不需要on ,可以用which 代替which one 但这不是省略.

1.I can't decide which one to buy能不能变成I can‘t decide to buy I can't decide to buy which one, well,I can't decide which one to buy. I can't decide which one to buy 为什么不可以to buy which one I can't decide _____.Ato buy which one Bwhich one to buyC to i can't decide which one l should buy i can't decide ____ a.which to buy b.to buy which I can't decide which one to buy now.Let me ___a decision tom I can't decide which one to buy.谁帮我分析一下句子结构 I can't decide which dress to buy.The red one ____is the blu I can't decide which dress to buy 为什么不可以说是I can't decide to i can't decide which to buy.为什么用to buy?buying可以吗