例如这段，开始的The first group 用的是过去时的单数was，然后后面的两个，The second group 和 The third group用的却是现在时的复数。是不是不太对？到底哪个对？
The first group was those who are risk-averse. If you are ….
The second group are those who are risk-tolerant. If you are ….
The third group he mentioned are those who are risk-seeking.
要看上下文。第一句前面有一个There were three. The first group was.....是紧跟这一句的。第二句和第三句是另外两个人在讲，陈述一般事实。。
-prbw100(tulock);
2018-6-4(#11564280@0)