I have a sister who works in Beijing.=I have a sister.The sister works in Beijing.
问题描述：
I have a sister who works in Beijing.=I have a sister.The sister works in Beijing.
答
勉强对吧...不过为了避免重复...the sister 改成she吧...
答
对的。The在这里特指前面已经提到过的人或事，也可以用my来替换the。
答
I have a sister who works in Beijing.=I have a sister. She works in Beijing （用she指代即可，不要再说一遍，这样很怪）
答
哥，你哪来这么多问题，要不你提问咱们刷分数吧
答
你的回答是对的。也可以说I have a sister. She works in Beijing.
答
对，the代指前面提到的
但这么说有点别扭，地道一点直接把后面的The sister 换成She就行
答
其他两个回答都对,但是在英语写作里,i have a sister who works in beijing,是一个独立句independent clause,the sister works in beijing 是一个related sentenc.他们不应该分开,应该合起来,可以像你第一句那样,或i...
答
是对的，这是从句。