which to choose与to choose which的区别

问题描述:

which to choose与to choose which的区别

造个句子就清楚了:
i don't know which to choose.我不知道选哪个.
i don't know to choose which.我不知道选哪个.
which to choose.本质上是个名词,to choose是后置定语
to choose which .则是个动词不定式短语

所做成分不同,前者which to choose是句子,后者(to choose which) choose后是which引导的宾语从句.