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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.