I can't decide which one to buy.谁帮我分析一下句子结构
问题描述：
I can't decide which one to buy.谁帮我分析一下句子结构
答
I（主语） can't decide （谓语）which one to buy（带疑问词的不定式短语作宾语）
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答
I 主语
can't decide谓语
which one英语
to buy不定式后置，做定语，修饰one
答
主语i
情态动词否定can't
动词decide
宾语which one
介词短语做定语to buy修饰one
答
I是主语，decide谓语动词，后面的 which one to buy作动词decide的宾语，是宾语从句。which one to buy 意为“买其中的哪一个”。