第一个可以用and she 换 who,但是第二个不行，因为 people (who are too stressed out and angry) may have too much yang, 主语是people，括号里的定语从句用来修饰people，may have 是谓语，too much yang 是宾语。括号的定语从句 who 是在定语从句中充当主语，充当主语时，关系代词who是不能省略的。只有关系代词在从句中做宾语时可以省略，例如：I don't like the girl [(who) you talked with just now].who 做talk with 的宾语，可以省略。...
例如：Miss Green is a strict but kind teacher who always cares for every student.句子中的who不能替换成and she吗？这里的who 能够替换成and she，变成前后两个并列的句子Miss Green is a strict but kind teacher and ...
