【点津】　(1)当that引导的结果状语从句为肯定句时，so...that...可以与be...enough to do换用；当that引导的结果状语从句为否定句时，so...that...可以与too...to...或be not...enough to do换用。

　　The child is so old that he can go to school.

　　＝The child is old enough to go to school.

　　那个孩子够大了，可以上学了。

　　David was so careless that he didn't find the mistakes in his test paper.

　　＝David was too careless to find the mistakes in his test paper.

　　戴维太粗心了，以至于没发现试卷上的错误。

　　(2)so...that...引导结果状语从句，有时可以与such...that...结构相互转换。

　　The stone is so heavy that I can't lift it up.

　　＝It is such a heavy stone that I can't lift it up.

　　那块石头太重，我拿不起来。

　　2．It is said that about 30,000 people attended this first exhibition，...据说大约30000人参加了这次首展……

　　It is said that为It is＋过去分词＋that句型

　　该句型中it是形式主语，真正的主语是that引导的主语从句。而且此处的it不能用其他词，如this，that等来代替。

　　在英语中，只有it可以作形式主语。

　　It is said that she is the richest woman in the world.

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