第三人称复数“They”代表已提到过的一些人或事。例如：
Where are the Glasses ,they are on the shelf
玻璃杯在哪，它们在架子上
"they"可以用来泛指一般人。例如：
They say that honesty is the best policy.
人们说诚实是上策
人称代词在句子中的功能。做主语，人称代词的主语在句中主要用做主语。例如：
I am interested in Playing tennis.
我对打网球很感兴趣.
She said she would be setting off on the 9:00 train.
她说她将乘9点的火车走.
我们请求老师把难句在讲解一次.
We asked teacher to explain the difficult sentences again.
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