5、非限定性定语从句不用that，只用who(whose, whom)和which代表人和物；
例如：
Her brothers, both of whom work in America, ring her up every week. 她的兄弟们，两个人都在美国工作，每个星期都给她打电话。
The buses, most of which were already full, were surrounded by an angry crowd. 那些大多已经坐满了人的公共汽车被一群愤怒的人围着。
That tower block, which cost five million dollars to build, has been empty for five years. 那个塔楼空着已经5年了。建它花了500万美元。
Cricket, which I know very little about, is a very popular sport in England. 板球是英格兰非常流行的体育活动，我对它知之甚少。
The accounts of the company ,which I’ve been paying great attention to, are in balance. 公司的账目是保持平衡的。我一直非常注意这些账目。
6、关系代词作从句的主语时，从句的动词必须和先行词的人称和数一致：
例如：
These are the operating instructions that/which are written in English. 这就是用英文写成的使用说明。
Are you staying at the white house which/that is newly completed and which /that has 15 bedrooms, 3 kitchens and 4 toilets? 你是住在那幢刚刚竣工、有15个卧室、3个病房和4个卫生间的白色房子里吗?
So far as I know, there are many VIPs who are going to attend the reception. 就我所知有很多达官贵人将出席这个招待会。
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