【英语】逗号后面不加that?

是不是说非限制性定语从句?
比如说：
Charles Smith,who was my former teacher,retired last year.
查理·史密斯去年退休了,他曾经是我的老师.
My house,which I bought last year,has got a lovely garden.
我去年买的的那幢房子带着个漂亮的花园.
This novel,which I have read three times,is very touching.
这本小说很动人,我已经读了三遍.
以上三个句子都是非限制性定语从句,主要特征就是逗号,然后which或who之类的,不能用that.
像这句话：This is the house which we bought last month.
这是限制性定语从句,这里的which就可以改用that~