一、人称代词he, she, it是第三人称单数。如:
He likes watching TV.他喜欢看电视。
She has lunch at twelve.她十二点吃午餐。
It looks like a cat.它看起来像只猫。
二、单个人名、地名或称呼作主语;是第三人称单数。如:
①Han Mei looks like her mother.韩梅看起来像她的母亲。
②Beijing is in China.北京在中国。
③Uncle Wang often makes cakes.王叔叔经常做蛋糕。
三、单数可数名词或"this / that / the+单数可数名词"作主语时,是第三人称单数。如:
①A horse is a useful animal.马是有用的动物。
②This book is yours.这本书是你的。
③That car is red.那辆小汽车是红色的。
④The cat is Lucy's.这只猫是露茜的。