定语从句(关系从句)充当修饰名词或代词的从句。 定语从句以关系代词开头 (who, whom, which, that, whose). 定语从句可以是限制性的或是非限制性的。 另请参阅下面的常见使用问题。

限制性定语从句

限制性定语从句是为了完成主句的意思是必不可少的。

Examples:

• Where is the girl who is going?
• That's the one that I like best.
• Is he the one whose house is on fire?

非限制性定语从句

非限制性定语从句为主要子句添加了定义，但对于含义不是必需的。 非限制性定语从句以逗号开头。

Examples:

• That girl, who is going to the concert, has a green dress.
• The orange car, which is my favorite, has seating for six.
• The tuba player, whose house is on fire, just went to band practice.

常见用法问题

尝试使用定语从句时，请注意：

• He was a loser. Who never thought he would win. [不正确]
• He was a loser who never thought he would win. [修订后]

关系代词应该在定语从句中紧跟先行词。 违反此规则会导致混淆：

• She saw the guy who dated Sheila who has a red mohawk. [不清楚]
• Does Sheila or the guy have a red mohawk? [令人困惑]

修订后的:

• She saw the guy, who has a red mohawk, who dated Sheila.

player [´pleiə]   n.游戏的人；选手   (初中英语单词)