专题九名词性从句

连接词that, whether, if引导的名词性从句 　　

　　1．that引导的名词性从句

　　(1)that在名词性从句中不作任何成分，引导宾语从句时有时可以省略，引导主语从句、表语从句和同位语从句时不能省略。

　　I think that you should turn to the teacher for help.(that不充当任何句子成分，也无实际意义)

　　我认为你应该向老师寻求帮助。

　　(2)that引导主语从句时，常用it作形式主语，常见句型有：

　　①It＋be＋形容词(necessary/right/likely/unlikely/wrong/important/certain等)＋that从句

　　It is wonderful that all of you have passed the difficult exam!

　　你们都通过了这次很难的考试真令人高兴！

　　②It＋be＋名词(短语)(a pity/a shame/a surprise/no wonder等)＋that从句

　　It is a pity that you have missed the wonderful lecture.

　　你错过了这么精彩的演讲真遗憾。

　　③It＋be＋过去分词(said/told/reported/decided等)＋that从句

　　It is suggested that the lab building (should) be built next year.

　　有人建议实验楼明年修建。

　　④It＋特殊动词(seems/appears/happens/matters)＋that从句

　　It appears that they have made the same mistake.

　　好像他们犯了同样的错误。

　　[名师指津]　在以下主语从句中，常使用虚拟语气，即"should＋动词原形"形式，其中的should可以省略。

　　①It is necessary/strange/important/natural etc.＋that ...

　　②It is a pity that ...

　　③It is suggested/requested/required/proposed/desired etc. ＋that ...

　　(3)动词find, feel, think, consider, make, believe等后面有宾语补足语时，需用it作形式宾语而将that引导的宾语从句后置。

I think it necessary that we take plenty of boiled water every day.我认为我们每天喝