关键句型 "which was recently bought by [agent]"
定义
此句型是一种相对从句(relative clause),用于修饰前面的名词,提供额外信息。结构为:which(关系代词)+ was(be动词的过去式)+ recently bought(过去分词短语,表示被动动作)+ by [agent](施动者)。根据《剑桥英语语法》教材,这种句型属于定义性相对从句,用于描述名词的特征或背景,使句子更连贯和信息丰富。例如,在文章中,“which was recently bought by Mr. Ian Thompson”修饰“a public house”,帮助读者理解背景。
它常用于正式或叙述性英语中,让句子避免重复主语。
用法
此句型主要用于描述过去发生的事件或状态,嵌入主句中以提供细节。规则:which 引导从句,必须指代前面的名词(通常是事物),并使用被动语态(was + past participle)。在语法体系中,它属于从句结构,与主句结合形成复杂句。横向比较:与非限制性相对从句(如 "which, by the way, was bought last year")相比,此句型是非限制性(无逗号),直接定义名词;与简单句相比(如 "Mr. Ian Thompson recently bought a public house"),它更紧凑,避免了独立句子的冗长。
跨语法点联系:它涉及被动语态和关系代词,与定语从句(如 "that was bought")类似,但 which 专用于非人称事物。学生可将此与时间状语从句(如 "after it was bought")联系起来,扩展句子复杂度。
例如,在叙述故事或新闻时,此句型能使描述更生动,如在房地产广告中说 "The house which was built in 1900 is for sale"。
注意事项
学生常犯的错误包括:误用 which 为 that(虽然可互换,但 which 更适合正式语境);或忽略被动语态,导致句子 grammatically incorrect,如 "which bought by [agent]" 应为 "which was bought by [agent]"。纠正建议:始终记住 which 后需跟完整从句,并练习被动语态的搭配。另一个常见问题是用错时态,如 "which is bought" 而非 "which was bought",忽略了过去事件。提供例句帮助区分:
错误示例:The car which buy by my father is old. // 错误:缺少 was 和过去分词。
正确示例:The car which was bought by my father is old.
练习时,注意句子流畅性,避免从句过长导致混淆。
练习
原创例子:假设你在讲述一个故事,可以说:“The old castle which was recently bought by a famous actor is now a museum.” 学生可替换关键词,如将 [agent] 改为 "a rich businessman",或将动作改为 "built by [agent]",创建新句子,例如:“The bridge which was recently built by the government is very strong。”
这种替换练习能让学生在日常叙述中应用句型,比如描述个人经历:“The book which was lent by my friend helped me a lot。” 通过修改,学生能加深对从句和被动语态的掌握,提升写作技能。
额外内容
背景知识:相对从句起源于古英语的复杂句结构,现代英语中广泛用于书面语,如新闻或小说,以增加描述性。对比分析:与中文的定语结构(如 "被[agent]最近买的酒吧")类似,但英语需用关系代词连接,强调语法精确性。与法语的相对从句(如 "qui a été acheté par")相比,英语版本更简单,无需性别或数的变化。这有助于学生理解英语的模块化表达,同时为学习更高级的从句(如条件从句)奠定基础,丰富语言表达力。