大学英语：There are estimated to be more than 20000 overseas domestic servants working in Britain

　　1. There are estimated to be more than 20000 overseas domestic servants working in Britain (p1)

　　译：据估计，在英国工作的外籍家佣有20000多人。

　　句子分析：此句为there be句型的变体。该句型是英语中常见句式，称“存在句”谓语动词一般由be充当，但还可以根据句意换成其它动词，如：

　　1). There are a lot of people in the meeting room.

　　2). There will be a meeting tomorrow.

　　3). There used to be a church at the corner of the street.

　　4). There happened to be an old friend of mine in the hotel.

　　5). There is sure to rain tomorrow.

　　6). There stands a bank next to my school.

　　另外，working in Britain是现在分词作定语，修饰domestic servants。

　　2. Of these 20000, just under 2000 are being exploited and abused by their employers, according to a London-based campaigning group which helps overseas servants working in Britain. (p1)

　　译：根据某个设在伦敦的帮助在英国工作的国外佣人的活动组织声称，在这20000名佣人中又近2000人被他们的雇主剥削和虐待。

　　句子分析：Of these 20000是状语，under 2000是数词作整个句子主语，are being exploited and abused是现在进行时态的被动语态做谓语，剩余的是状语。另外，under是低于…不到…的意思;---based设在…的，以…为基础的;