从句 Clauses

定语从句 Relative Clauses

修饰名词或代词，由关系代词（who, whom, whose, which, that）或关系副词（when, where, why）引导。

例句：

• The book which I bought yesterday is very interesting.
• The man who is standing there is my teacher.

限制性 vs 非限制性

类型	说明	标点
限制性	不可省略，影响句意	无逗号
非限制性	可省略，补充说明	有逗号

非限制性从句例句：

• My brother, who lives in Beijing, is a doctor.

状语从句 Adverbial Clauses

修饰动词、形容词或副词。

时间状语从句

• When I arrived, he had already left.
• I will call you after I finish my work.

条件状语从句

• If it rains tomorrow, we will stay at home.
• I won't go unless you come with me.

原因状语从句

• I stayed at home because I was sick.
• Since you are here, let's start.