英语的定语从句，哪些情况从句与主句之间要加逗号？

非限制性定语从句和主句之间有逗号。判断限制性还是非限制性要看从句和主句的关系。如果从句对主句来说不可或缺，少了主句意思不完整，就是限制性定语从句，如：Do you remember the place where we visited last week?而非限制性定语从句是对主句的一个补充说明，去掉主句意思依然完整，如, He came back yesterday, which made his parents very happy.再如，2008 Olympic Games was held in Beijing, as we all know.

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