一句定语从句,帮忙解答,谢谢.There are ten classes in each week,which mean

这里是非限制性定语从句.
简单说来,限制性定语从句是对先行词的限定,而非限制定语从句则是对先行词的解释,说明或补充的.另外,限制性定语从句一般不能和先行词分开,而非限制性定语从句则可以.系统地说如下:
1) 定语从句有限制性和非限制性两种.限制性定语从句是先行词不可缺少的部分,去掉它主句意思往往不明确；非限制性定语从句是先行词的附加说明,去掉了也不会影响主句的意思,它与主句之间通常用逗号分开,例如：
　　　This is the house which we bought last month.　　　这是我们上个月买的那幢房子.（限制性）
　　　The house,which we bought last month,is very nice.这幢房子很漂亮,是我们上个月买的.（非限制性）
2) 当先行词是专有名词或物主代词和指示代词所修饰时,其后的定语从句通常是非限制性的,例如：
　　　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.
3) 非限制性定语从句还能将整个主句作为先行词,对其进行修饰,这时从句谓语动词要用第三人称单数,例如：
　　　He seems not to have grasped what I meant,which greatly upsets me.他似乎没抓住我的意思,这使我心烦.
　　　Liquid water changes to vapor,which is called evaporation.液态水变为蒸汽,这就叫做蒸发.
说明：关系代词that和关系副词why不能引导非限制性定语从句.

which 引导非限性定语从句，在此例中which只前面整个句子。这句的汉语意思是每周有10节课，这就意味着我们这学期我们有许多空闲时间。(不加which也可以成句啊)，比如： There are ten classes in each week, (it is) means that we have many spare time in this term. 或者连it is 也去掉，我一直...

加逗号，表示which指代“There are ten classes in each week”，不加表示which指代“each week”，这样讲不通啊。其实这个句子和汉语差不多啦。(不加which也可以成句啊)，比如： There are ten classes in each week, (it is) means that we have many spare time in thi...

加逗号是非限制性定语从句，不加的话是普通定从。非限只能是“，which”的结构，不能是"，that”，指代前面的一周十节课。具体你可以搜索非限制性定语从句看看。(不加which也可以成句啊)，比如： There are ten classes in each week, (it is) means that we have many spare time in this term. 或者连it...