Question

英语问题1

Don't talk about such things of ()you are not sure.为什么是which而不是as?

Answer 1

don't talk about such things of which (that) you are not sure.
of 是介词，后面跟宾语。you are sure作定语修饰which，前面省略了that，从which开始往后是定语从句，先行词是which。整句句子不是任何从句，而是单句。主干为：don't talk about such things of which。
想用as是把句子理解为了定语从句。
加油！

Answer 2

be sure of sth 是固定用法后面接的是名词 things后面跟的句子是定语从句 定语从句中修饰名词的一般都是用which，as没有这个用法，as一般是接状语从句

1.确信的,有把握的[Z][F][+(that)][+wh-][(+about/of)]
I'm not sure whether our team will win.
我不能肯定我队是否能赢。
We are sure of his innocence.
我们确信他是无辜的。
2.一定的,必定的[Z][F][+to-v]
She is sure to write to you.
她一定会给你写信的。
3.确实的;可靠的
One thing is sure, he won't let you down.
有一点是确定的,那就是他不会让你失望。
Exercise is a sure way of losing weight.
运动是减肥的可靠办法。
4.稳健的;稳固的

Answer 3

此处的先行词是things which引导定语从句 而as表示例如的意思 you are not sure 是things的补充