With no one to talk to,John felt upset.
talk后面为什么还要再跟一个to,希望能从语法上分析一下
【答】to talk to 是动词不定式作定语,修饰 one ;介词短语 With no one to talk to 是 felt upset 的原因状语。talk to ...= talk with ...,意思是“与 ......谈话/交谈”,这里的 to 是介词。