举例 I think it necessary that we take plenty of hot water every day .我认为每天多喝开水是有必要的。
That引导的从句
名词性从句定语从句一、名词性从句1、分类语法功能:主语、宾语、表语、
同位语从句连接词:that从句wh-从句(who/whom/whose/where…)(1).引导
主语从句①、置于句首,不能省略Thatheisstillaliveissheerluck.②、置于句末,通常用it作先行词Itisn’tsurprisingthatyouhavefailedyourexam.如果以that从句为主语的句子是疑问句,只能用it作形式主语结构Isitpossiblethathewouldrunacompany.(2).引导
宾语从句①、较短的句子,可省。从句太长,不宜省。两个及两个以上从句同时作宾语时,最后一个that不能省Sheadmitted(that)youhadknownherbefore,andthatyouhadsentagifttoher.②、that从句可跟在形式宾语it之后作介词的实际宾语I’mlookingforwarditthathewillforgiveme.③、固定搭配:inthat因为exceptthat除了savethat除了besidesthat除了butthat要不是Hehatesherinthatsheisnoisy.④、that从句双宾语结构动词advice、ask、assure、promise、question、warm可省间接宾语Heasked(us)thatweshouldpaythebill.tell、inform、remind、show、teach不能省间接宾语Hetoldusthatweshouldpaythebill.⑤、当主句
谓语动词为assume、believe、expect、guess、imagine、suppose、think等表示“认为”、“猜想”的动词时,否定主句往往是否定去宾