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it的用法常常出现在高考英语的单项选择题上，下面就总结下关于it的20种用法： 1.It is+被强调部分+that 该句型是强调句型，将被强调的放在前面，其他部分置于之后，强调的主语如果是人，可以用来替换，如果把这种句型结构划掉后，应该是一个完整无缺的句子，这也是判断强调句型与其他从句的方法。 It was they that (who) cleaned the classroom yesterday. It was in the street that I met her father. It was with great joy ___he received the news that his lost daughter had been found. (2004 福建) A. because B. which C. since D. that (D) 2. It is not until +被强调的部分+ that 该句型译成汉语“直到……才，可以说是的强调形式。It was not until she took off her dark glasses that I realized she was a film star. =Not until she took off her dark glasses did I realize she was a film star. =I didn’t realize she was a famous film star until she took off her dark glasses. It was ___back home after the experiment. (2004 湖北) A. not until midnight did he go B. until midnight that he didn’t go C. not until midnight that he went D. until midnight when he didn’t go (C) | 
