为什么用work(on)farm而用work(in)factory?什么时候用ON或IN?

为什么用work(on)farm而用work(in)factory?什么时候用ON或IN? farm前的介词怎么用·为什么Farmers work on a farm介词用on而Sometimes I work in a farm介词却用in为什么不同?farm前面到底怎么用介词呢? on the farm 为什么用on farm 前用什么介词?通常会说：I work on a farm. 可又看到说：I am a farmer （in） a farm. 为什么?还看到过 at the farm.到底怎么用?谢了 Work in a hospital为什么不能用Work on a hospital就是回答别人在哪里工作的时候,为什么在农场工作就是I work on a farm而在回答什么在医院工作跟警察局就是 work in a hospital.在什么样的情况下用on,在什 It was on the farm where my father used to work that I was born.为什么用where,而不是 that The teacher,with the student is going to work on the farm this sunday 为什么用is my uncle works on a farm now. 什么用介词on 而不用at on the farm =at the farm 谢谢书上印的 ：at on the farm =at the farm 谢谢 应该用on farm 还是on tne farm 求介词+某地点的固定用法.还有在农场里为什么要用on a farm?而不用In. a farm前跟介词为什么用on? 用works或work填空：Every day ,his parents make him ( ) on the farm. Thanks for helping us __ our work on the farm(用介词填空） The workers were made to work on the farm为什么用to 这个被动语句 请用初二的语言来分析这的英语句子成分. His elder brother works on a farm.（用in a factory改为选择疑问句）----------- his elder brother work on a farm --------- in a factory? 是in farm还是on farm为什么 The old men work on a farm,they are ( )(farm) My grandparents work on a farm.中文