如果是壹般現在時,第壹人稱變為第三人稱單數時：
1 be 動詞中的am要改為is ， 如 I am a student . -> He/ She is a student .
have 改為has , 如 I have a pen . -> He / She has a pen .
2 實義動詞作謂語時，變第三人稱單數時謂語動詞要加s / es，動詞第三人稱單數的變化規則是：
1）壹般在詞尾加s，如 open - opens
2)以s ,x ,ch ,sh ,o 結尾時，直接 在後面中es ，如 pass - passes ; fix - fixes ; watch - watches ; wash - washes , do - does
3)以輔音字母加y 結尾時，變y 為i 再加es，如 carry - carries
例句：
1） I go to school on foot . -> He goes to school on foot .
2) I help Jim clean the windows . -> She helps Jim clean the windows.
3) I do my homework in the evening.-> He does his homework in the evening .
如果是壹般過去時，實義動詞作謂語時都是用過去時（不受人稱和數的影響）如
I did my homework just now.
He did his homework just now .