主系表+that,其中that做的是表语从句不?还是宾语从句耶?

主系表+that,其中that做的是表语从句不?还是宾语从句耶? that is a green pen表语和宾语是否都是pen,其中that是主语? the book is helpful that...that是表语从句?The good news is that we have passed the exam.也是表语?第一个句中的that从句做book的定语，因此属于定语从句，表语为helpful?that不是跟在helpful后面么？所以helpful是 Who is that beside her?其中who是表语还是主语?that是主语还是表语?如何区分特殊疑问词是何成分? 可以说 That is because my car broke down.because 是引导原因状语从句的,可不可以用在 that is 后面做表语呢?请语法高人回答! be aware that是什么从句,that引导的是表语从句还是宾语从句 it seems that 从句,中从句是做主语还是表语? that 引导的表语从句中that 可否省略 名词性从句中表语从句的that做什么成分,比如the trouble is that the boy is little 这是表语从句吗reasoning that because deception makes peole uncomfortable.这里的that引导的是表语从句吗,请帮分析一下 一道名词性从句选择题Why not try your luck downtown Jackson?That's _____the best job is.(答案是where)我是这样分析的：That's 后引导的是表语从句,where是连接词,where在表语从句中做表语成分,构成了主系表结 as语法分析the bridge is three times as long as that one.three times 和as long as做什么成分?your room is the same size as mine.其中the same size 和as做什么成分?我的认为是:three times long 做表语，第一个as做副词修饰 the book is helpful that...that从句做book的定语,属于定语从句?helpful是先行词that是修饰helpful啊?第一个句中的that从句做book的定语,因此属于定语从句,表语为helpful? that不是跟在helpful后面么?所以helpfu it appears that是主语从句还是表语从句啊?还有 那个that可以省略的吗？？ I am sure that...的句子成分?sure是表语,that后面应该不能加宾语或补语吧? 定语从句里that可以做的成分有哪些?(除了主语和宾语外）可以做表语吗? It seems that引导的是表语从句还是主语从句啊? 关系代词that引导定语从句,在从句中做表语,that 可以省略吗?