1、表示文中的人说的话。

I've been thinking about this afternoon, you know,said Halliday rather suddenly.

2、引用单词或短语。

How do you spell the word “across”?

3、不寻常的词语也常用引号，以引人注意。

The noun to which a relative pronoun refers is called the “antecedent” of the pronoun.

关系代词所指代的名词唤作关系代词的“先行词”。

4、书名和诗文名也用引号。

Have you read, “The Jungle”?

你读过《屠场》吗？