首先,可以将这个句子分开成两个句子。Doctors tell white lies to a patient.A patient may enjoy a longer life.这句话的意思是“对于那些听到医生善意谎言的病人,他们的生命会更长久一些。”。改为定语从句为:A patient who tell white lies to may enjoy a longer life. 但是正常情况下,带有介词的定语从句需要将介词提到前面,即A patient to whom tell white lies may enjoy a longer life. 补充问题:个人认为whom不可以省略。