考点一 主语从句
一、that引导的主语从句
1.that引导主语从句时,在从句中不作任何成分,也没有词汇意义,但一般不可省略。
That the earth goes around the sun is known to us all.
众所周知,地球围着太阳转。
2.that引导主语从句时可用it作形式主语,that不可省略。常见句式主要有以下几种:
(1)It+be+形容词(necessary/likely/important/certain等)+that从句
(2)It+be+名词(短语)(a pity/a shame/no wonder等)+that从句
(3)It+be+过去分词(said/told/reported等)+that从句
(4)It+不及物动词(seem, appear, happen, matter等)+that从句
It occurred to him that he had an important conference to attend the next morning.
他突然想到,第二天上午他有重要的会议要参加。
注意:在“It+be+suggested/advised/ordered/requested/insisted/required...+that从句”结构中,从句谓语应用“(should+)动词原形”。