知识点一、定语从句与并列句的区别
请观察下面三个句子：
1．Wang Hong failed in the College Entrance Examination, ______ disappointed his mother.
2．Wang Hong failed in the College Entrance Examination and ______ disappointed his mother.
3．Wang Hong failed in the College Entrance Examination; ______ disappointed his mother.
第一句话：句中有逗号，根据句意可知，空白处的内容应该指的是前面整个句子的内容，是对前文信息的补充说明，因此，此句是非限制性定语从句，用关系代词which；
第二句话：句中有并列连词and，因此整个句子是一个并列句，所以可以用代词it指代前面句子的内容。
第三句话：句中有分号，这表明整个句子是一个并列句，因此可以用代词it指代前面句子的内容。
