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it 在句中作形式主语或形式宾语的替代用法 1、it作形式主语可以代替句中的动词不定式、动词-ing分词或一个句子。 It is important for us to learn English well.(it替代不定式 to learn English) It is no use making such an apology to us Chinese.( It 替代动词-ing分词 making such an apology) It is happy for her parents that she is well now.(it 替代句子that she is well now) 2、it作形式宾语可以代替句中的动词不定式，此时句中的谓语事由某些特殊动词(如： findthinkfeel等)充当的。 I find it impossible to finish so much work in such a short time. (it 替代不定式to finish so much work) thatthis在句中的替代用法 1、 that A: I’m going to wear my new jeans to her party. B: You can’t do that.(that替代to wear my new jeans to her party这一事情) 2、this this 在介绍某人或某物时，指的是靠近自己的一方。 A: Hi, Mr Smith, This is my friend ,Bill. B: Nice to meet you，Bill. C: Nice to meet you, Mr Smith. This 在电话用语中指的是自己。 A: Hello, may I speak to Miss Li? B: This is Miss Li speaking.(我就是李女士。) | 
