
1、 定语从句中的名词已由关系代词取代,再用代词则是多余的。如:She bought the book (that) she had first asked for it.I have seen the girl (whom) you are talking of her.
2、 用不定式作定语时,如果其逻辑宾语或介词宾语就是被修饰的名词词组,后面再用代词是多余的。如:The tea is too hot to drink it.He is a good comrade to work with him.
3、 在“形容词 + 不定式”句型中,如果不定式的逻辑宾语或介词宾语就是句子的主语,再用代词作宾语或介词宾语则是多余的。如:This question is too difficult to answer it.The house is nice to live in it. (from www.nmet168.com)
4、 在“连词 + 分词 / 名词 / 形容词 / 副词 / 介词词组”结构中,加上代词作主语是多余的。如:He took notes while he reading.If it heated, ice turns to water.