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替代词，就是在日常学习中所用的代词或量词。针对学生们常见的一些练习和考题， 总结了一下几种特殊替代用法： 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) that this在句中的替代用法 1、 that A: Im going to wear my new jeans to her party. B: You cant 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. | 
