動(dòng)詞單三變化規(guī)則

　　1.一般情況下，直接在動(dòng)詞詞尾+s：

　　2.以s，x，sh，ch，o結(jié)尾的動(dòng)詞，在詞尾+ es：

　　3.以輔音字母+ y 結(jié)尾的動(dòng)詞，先把y變?yōu)閕，再加es：

　　4.不規(guī)則動(dòng)詞（特殊情況）：

　　變否定句時(shí)遵循的規(guī)則

　　含有動(dòng)詞第三人稱單數(shù)形式的句子變否定句時(shí)，要在動(dòng)詞前面加上doesn’t 或does not，動(dòng)詞的第三人稱單數(shù)形式要還原成原形：格式為doesn’t/does

　　not+ 動(dòng)詞原形，如：

　　He goes to school at six in the morning. (變否定句) 就變換為：

　　He doesn't go to school at six in the morning.

　　2.變一般疑問句：把含有動(dòng)詞第三人稱單數(shù)形式的變成一般疑問句時(shí)，要借用助動(dòng)

　　詞does，如：

　　She goes home at five every day.（變疑問句）就變換為：

　　Does she go home at five every day? -- Yes，she does./No，she doesn’t.

　　哪些主語是第三人稱單數(shù)

　　1.人稱代詞he，she，it；

　　如：He likes watching TV.

　　She has lunch at twelve.

　　It looks like a cat.

　　2.單個(gè)人名、地名或稱呼作主語；是第三人稱單數(shù)。如：

　　Han Mei looks like her mother.

　　Beijing is in China.

　　Uncle Wang often makes cakes.

　　3.單數(shù)可數(shù)名詞或

　　this/that/the+單數(shù)可數(shù)名詞作主語時(shí)，是第三人稱單數(shù)；

　　A horse is a useful animal.

　　This book is yours.

　　That car is red.

　　4、不可數(shù)名詞作主語時(shí)為第三人稱單數(shù)。如：

　　The milk is in the glass.

　　The bread is very small.

　　The water is very cold.