定语从句中that可以省略吗？
在定语从句中，关系代词that有时可以省略，但通常有以下条件：
引导词在从句中作宾语。当关系代词that引导的定语从句在句中作宾语时，可以省略。
例如：The book (that) I read yesterday is very interesting. 我昨天读的那本书很有趣。
引导词在从句中作重复先行词。当关系代词that引导的定语从句在句中作重复先行词的宾语时，可以省略。
例如：This is the book (that) I bought yesterday. 这就是我昨天买的那本书。
引导词在从句中作表语。当关系代词that引导的定语从句在从句中作表语时，可以省略。
例如：(That) He is a kind person is known to all. 他是一个善良的人，这是众所周知的。
需要注意的是，关系代词that在限制性定语从句中作介词宾语时，一般不能省略，但在非限制性定语从句中可以省略。此外，当关系代词that引导的定语从句在句中作主语时也不能省略。
定语从句that在句子中充当主语时不可省略，但作为宾语时可以省略。如：1、This is the book (that）（代指前面的the book）I bought yesterday.2、I like the book that （同上）is intrersting.
什么是定语从句
定语从句（也称关系从句、形容词性从句），是指一类由关系词（英语：relative word）引导的从句,因为这类从句的句法功能多是做定语，所以曾被称为定语从句（英语：attributive clause），这类从句除了可以做定语之外，还可以充当状语等其他成分，所以现代语言学多使用“关系从句”这一术语。
在英语中，定语从句主要通过关系代名词法构成。
定语从句关系构成
关系从句的句法功能主要是充当定语。在英语中，关系从句通常位于它所修饰的词（组）之后。被关系从句修饰的词（组）叫做先行词（英语：antecedent），引导关系从句的词称为关系词，关系词指代先行词并在关系从句中充当一定的成分。例如：
This is the book which interests me.（“which interests me”是关系从句，修饰先行词“book”，而关系词“which”指代先行词“book”并在关系子句中充当主语。这句话可以拆分为两个句子来理解：“This is the book.”和“The book interests me.”）
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绛旓細濡傛灉鍏崇郴浠ｈ瘝that鍦浠庡彞涓鍋氬璇紝灏鍙互鐪佺暐銆傚锛歵he flowers 锛坱hat锛 I bought yesterday...that鎸囦唬flowers锛屽湪浠庡彞涓仛bought鐨勫璇紝灏卞彲浠ョ渷鐣ャ傚仛涓昏鐨勮瘽灏变笉鑳界渷銆傚锛欰ll that glitters is not gold. 鍙戝厜鐨勪笉閮芥槸閲戝瓙銆倀hat鍦ㄤ粠鍙ヤ腑鍋歡litter鐨勪富璇紝鎵浠ヤ笉鑳界渷銆
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绛旓細鍙湁"鍏堣璇+鍏崇郴浠ｈ瘝/鍏崇郴鍓瘝+瀹氳浠庡彞"鎵嶆槸涓涓畬鏁寸殑瀹氳浠庡彞锛屼笉杩囷紝鍏崇郴浠ｈ瘝鍦瀹氳浠庡彞涓浣滃璇垨鑰呬綔琛ㄨ鏃鍙互鐪佺暐锛涗絾鑻ュ叧绯讳唬璇嶄綔浠嬭瘝鐨勫璇佷粙璇嶅張鎻愬墠鐨勮瘽锛屽叧绯讳唬璇嶄笉鑳界渷鐣銆侶ere is the man (whom/ who/ that) you want to see.杩欏氨鏄綘鎯宠鐨勪汉銆侷 don't like people who/that...
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