they是第三人称的复数形式，无性别之分，代表已提到过的一些人或事,在句中多用作主语，通常放在它所指代的名词之后，偶尔也可放在它所指代的词之前。

例句：‘Where are John and Liz?’ ‘They went for a walk.’“约翰和利兹在哪儿？”“他们去散步了。”The rest, as they say, is history.其余的就尽人皆知，不须赘述了。They now say that red wine is good for you.现在专家说喝红葡萄酒对人有好处。