推荐回答（2个）
首先看定义：非限定性定语从句起补充说明作用，缺少也不会影响全句的理解，在非限定性定语从句的前面往往有逗号隔开，如若将非限定性定语从句放在句子中间，起前后都需要用逗号隔开。
从定义上来看，非限定性定语从句不一定非用逗号隔开，但用逗号隔开一定是非限定性定语从句。
例句：
1.Attitudes towards daydreaming are changing in much the same way that(in which) attitudes towards night dreaming have changed.
人们对白日做梦的态度正在改变，这与人们对夜间做梦的看法的变化有非常相似之处。
2.I like the music for the very reason that(for which) he dislike it.
我出于某种原因喜欢这种音乐，而他恰恰与我相反。
3.We arrived the day that(on which) they left.
刚好我们到的那天他们走了。
相关知识：非限定性定语从句的使用规则及注意事项：
1. which引导的非限定性定语从句是用来说明前面整个句子的情况或主句的某一部分。
2. 在引导限定性定语从句时，that有时相当于in which, at which, for which或at which 。其中，介词的选用，依据从句中的动词所需搭配的介词来选用。
3. as有时也可用作关系代词 。
4. 在非限定性定语从句中，关系词不能用that。
希望那个你能明白！
非限制性定语从句就是有逗号的，没有逗号的就不是非限制性定语从句了
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