有关定语从句

Question

是i saw a dog which is red running in the park.
还是i saw a dog who is red running in the park.
希望大家能给我一个准确答案，谢谢

Answer 1

答案：A in which

Many people who had seen the film were afraid to go to the forest when they remembered the scenes (in which) people were eaten by the tiger.

解析：
1）判定同位语从句的以下几个参照标准
a）从句前名词的属性：
通常是抽象名词，如：news (消息)，reason（理由），cause（原因），idea（想法），theory （理论）等；
b）没有关联词从句是否缺少成分
最主要的是定语从句的 that 在句子中充当主语、宾语或表语，而同位语从句的that 只是一个起连接作用的语言符号，在句子中不充当任何成分（这一点与主语从句、宾语从句或表语从句是一致的），只要分析句子成分就会发现。
c）名词与从句间是等同关系
也就是说名词本身只代表一个概念，而从句是给以这个概念的一种诠释，可以把 that 改为破折号或括号，也可以用 namely，that is to say，i.e. 等同义词语替换。

2）题目分析：
a）主句： Many people who had seen the film were afraid to go to the forest 看过电影的人都不敢去那个森林
b）时间状语：they remembered the scenes __ people were eaten by the tiger
先把它化简成两个简单句：
* they remembered the scenes. 他们记得那几个场景。（不止一个）
* people were eaten by the tiger.人们被老虎吃掉
c）如果是同位语从句，那就是对抽象名词 scenes 的具体解释，即，那场景也就是老虎吃人的场面。言外之意，老虎几次吃人时他们就在那种恐怖的现场，但是，主句已经指明他们是看过电影后才不敢去的，此处用 that 语法上虽然没有错误，但是却背离了原句要表达的意思。
d）如果改写过的第二句变成 people were eaten by the tiger (in the scenes)，意思就成了“人们那几个场景中被老虎吃掉的” ，正好符合原句的意思，变成定语从句则为：(in which) people were eaten by the tiger。

Answer 2

第二个，which一般指代的是事，人或有生命的一般用who

Answer 3

是第一个。who专指人，which指其他的。

Answer 4

I saw a dog which（that） is red running in the park.

Answer 5

什么是定语从句？