1. 普通名词先行词：先行词是一个具体的名词，如 "The book (which) I borrowed from the library is very interesting."（我从图书馆借来的那本书非常有趣。）
2. 人称代词先行词：先行词是人称代词，如 "He is the person (who) helped me."（他是帮助过我的那个人。）
3. 物主代词先行词：先行词是物主代词，如 "This is the house (whose) roof was damaged in the storm."（这是在暴风雨中屋顶受损的那座房子。）
4. 指示代词先行词：先行词是指示代词，如 "I don't like this dress (that) you bought for me."（我不喜欢你给我买的这件连衣裙。）
5. 数词先行词：先行词是一个数词，如 "I have three cats, two of (which) are black."（我有三只猫，其中两只是黑色的。）
6. 形容词先行词：先行词是一个形容词，如 "I bought a new laptop, which is very fast."（我买了一台新的笔记本电脑，它非常快。）
