为什么要用定语从句啊?比如I little know that she is his sister.为什么要用that啊

为什么要用定语从句啊?比如I little know that she is his sister.为什么要用that啊 i know that he is a canadian athlete.为什么要用that呢? 定语从句题,为什么要用which而不用that?非限制性的定语从句不是用that么? 英语语法问题It is the doll that my sister loved most为什么不是定语从句呢 定语从句问题：Jasper hopes that she will turn cars to stone。这句话为什么要 i remember the days that we spent together这句定语从句的连接词为什么要用tha 这里为什么用that,这不是非限定性定语从句吗? 这个定语从句为什么用where而不用that doesn't want to know that which she is eager to know.这里为什么用w What is the reason that he gave for this?为什么是定语从句啊 I know the difference that there is between you.that句子是定语从句还 定语从句中that能做主语吗.比如 I believe that is the best.