1.人称代词 he, she, it 属于第三人称单数。

eg.How old is he?

2.不定代词everyone, something, nobody, everything, everybady,nothing属于第三人称单数。

eg.He is nothing but a child.

3.指示代词this，that作主语时属于第三人称单数。

eg.That is a apple.

4.人名，称呼作主语属于第三人称单数。

eg.Andy is a good boy.

5.地名，机构名作主语属于第三人称单数。

eg.Nanchang is a beautiful city.

6.单数名词(A/the/this/that+单数名词)作主语时属于第三人称单数。

eg.The girl is listening.

7.不可数名词作主语时，属于第三人称单数。

eg.The air is polluted.

8.当数字或字母作主语时，属于第三人称单数。

eg."K" is a letter.

9.数字的加、减、乘、除常被当作第三人称单数

eg.What is there and two? 收起