my mother是第三人称单数。第三人称单数是语言中对对话双方外其它某一个人指示时使用的代词。
第三人称单数的用法:在一般现在时中,当主语是第三人称单数时,谓语动词要用第三人称单数形式,即在动词原形后加s。
My mother cares much about me in my life and study.
My mother is a teacher of primary school.
My mother is really a good mother,and I love her so much.
My mother is a teacher and she taughtme from my Grade 1 to Grade 3 in primary school.