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.