17.2 名詞性that-從句
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1)由從屬連詞that引導(dǎo)的從句叫做名詞性that-從句。 That只起連接主句和從句的作用,在從句中不擔任任何成分,本身也沒有詞義。名詞性that-從句在句中能充當主 語、賓語、表語、同位語和形容詞賓語,例如:
  主語:That he is still alive is sheer luck.  他還活著全靠運氣。
  賓語:John said that he was leaving for London on Wednesday. 約翰說他星期三要到倫敦去。
  表語:The fact is that he has not been seen recently.   事實是近來誰也沒有見過他。
  同位語:The fact that he has not been seen recently disturbs everyone in his office.
        近來誰也沒有見過他,這一事實令辦公室所有的人不安。
  形容詞賓語:I am glad that you are satisfied with your job.
        你對工作滿意我感到很高興。

2)That-從句作主語通常用it作先行詞,而將that-從句置于句末,例如:
   It is quite clear that the whole project is doomed to failure. 很清楚,整個計劃注定要失敗。
   It's a pity that you should have to leave. 你非走不可真是件憾事。
  
   用it作形式主語的that-從句有以下四種不同的搭配關(guān)系:
  a. It + be +形容詞+ that-從句
    It is necessary that…    有必要……
    It is important that…    重要的是……
    It is obvious that…     很明顯……


  b. It + be + -ed 分詞+ that-從句
    It is believed that…     人們相信……
    It is known to all that…   從所周知……
    It has been decided that…   已決定……


  c. It + be +名詞+ that-從句
    It is common knowledge that…  ……是常識
    It is a surprise that…   令人驚奇的是……
    It is a fact that…     事實是……


  d. It +不及物動詞+ that-分句
    It appears that…      似乎……
    It happens that…      碰巧……
    It occurred to me that…   我突然想起……














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