Question

帮我分析一个英语句子，谢谢！

For a social epidemic to occur, however, each person so affected, must then influence his or her own acquaintances, who must in turn influence theirs, and so on;
who must in turn influence theirs,这里的who和theris分别指代了什么？

Answer 1

首先这是一个if引导虚拟语气的句子。三言两句是说不清楚，建议你到网上输入虚拟语气，会给你更完整，更权威的解答。如果找不到食物，那时的人们往往会饿死，，特别在冬天的时候。从句；iffoodwasdifficulttofind,especiallyduringthecoldwintermonths。difficult形容词当表语，tofind形容词的宾语，especiallyduringthecoldwintermonths当时间状语。主句Atthattimepeoplewouldstarve。

Answer 2

who，引导非限定性定语从句，指代acquaintances；
theirs指代“acquaintances”的acquaintances。