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）一般在詞尾加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)以子音字母加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 . 如果是一般過去時，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 .
第一人稱改為第三人稱時謂語動詞要作相應的變化 如果是一般現在時,第一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）一般在詞尾加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)以子音字母加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 . 如果是一般過去時，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 .