That在名词性从句中的用法归纳
作者：吴彩霞
来源：《新课程·教研版》2010年第11期
        连词that在引导名词性从句时，本身无意义，在从句中只起连接作用，不担任任何句子成分，不含有疑问语气，有时可以省略。下面按名词性从句的语法分类，对that在其中的用法进行比较和分析。
       
        一、主语从句
       
        (1)that在主语从句中只是引导词的作用，不作甸子成分，不能省略。
        例如：That you are coming to London isthe best news I have heard this long time.
        (2)如果主语从句太长，可以用it作形式主语代替that主语从句，以达到平衡句子的作用。
此时的that也不能省略。
        例如：
        It’s unlikely that he’ll come.
        It’s a fact that they won the game.
        It seems that he has known the truth.
        It’s reported that there will be a stormtomorrow.
       
        二、表语从句
       
        That在引导表语从句时没有词义，不含疑问意义。在口语中，有时可以省略。
        例如：
        The trouble is(that)they have lost theirway.
        Her wish is that she could lose weightsoon.
       
        三、同位语从句
       
        That在引导同位语从句时无词义，不作句子成分。不含疑问意义。
        例如：
        The news that he went abroad is nottrue.
        Word came that Professor Lee wouldcome to our school.
        The fact that women can word as well asmen is clear.
       
        四、宾语从句
       
        That在引导宾语从句时，只起引导词的作用，在句中不做语法成分。在口语中和非正式文体中可以省略。
        例如：
        I’ll prove to the world that he was right.
        She always complains that he is down onher.
        这类从句一般不能作介词宾语，但是在in，but，except，besides等少数介词后可以使用，形成固定搭配。
        例如：
        I’ll go with you，except that I have toword that day.
        Men differ from brutes in that they earlthink and speak.
        That引导的宾语从句不能省略的情况：
        1.　如果宾语从句过长，可以用it充当形式宾语代替宾语从句。这种结构中That不能省略。
        I think it wrong that he didn’t tell thetruth.
        We took it for granted that he will takeover his father’s job.
        I hate it when people talk with theirmouths full.
        2.　几个宾语从句并列时，从第二个开始的宾语从句中的That不能省略，或者句子结构很复杂有多个状语时，或者谓语动词与That之间有插入语时，That不能省略。
        例如：She promised(that)she would come andsee him sometimes，and that she would neverforget him.
        We decide，as he has suggested.that wewill start out tomorrow.
       
weight的用法搭配