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，即常在动词原形后加-s或-es。那哪些主语是第三人称单数? 快来一起学习学习吧！
（一）哪些主语可以做第三人称单数
1.人称代词he, she, it是第三人称单数；He likes watching TV. 他喜欢看电视。She has lunch at twelve. 她十二点吃午餐。It looks like a cat. 它看起来像只猫。2.单个人名、地名或称呼作主语时，是第三人称单数。Han Mei looks like her mother. 韩梅看起来像她的母亲。Beijing is in China. 北京在中国。Uncle Wang often makes cakes. 王叔叔经常做蛋糕。3.单数可数名词或this/ that/ the+单数可数名词作主语时，是第三人称单数； A horse is a useful animal. 马是有用的动物。This book is yours. 这本书是你的。That car is red. 那辆小汽车是红色的。The cat is Linda\\\\'s. 这只猫是琳达的。4.不定代词someone, somebody, nobody, everything, something等及指示代词this, that作主语时，是第三人称单数。There is something wrong with the watch. 这块手表有问题。That is an eraser. 那是一块橡皮擦。The milk is in the glass.牛奶在玻璃杯里。The bread is very small. 那面包很小。The water is very cold. 那些水很凉。“7” is a lucky number in western countries, but “8” is a lucky number in China. “7”在西方国家是个吉利数字，但在中国“8”是个吉利数字。“I” is a letter and a word. “I”既是个字母，又是单词。 一般现在时的肯定句中，主语为第三人称单数的动词变化主要体现在词尾的变化上，其规律为： | | |
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| 2、以s, x, sh, ch, o结尾的动词，在词尾+ es | | |
| 3、以辅音字母+ y 结尾的动词，先把y变为i，再加es | | |
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（1）当主语是第一，二或复数时，要用don\\\\'t构成否定句，主语+ don\\\\'t +动词原形(+其它)。I do morning exercises in the garden.（变否定句）→I don\\\\'t do morning exercises in the garden.You/ We/ They jump rope in the playground. （变否定句）→You/ We/ They don’t jumprope in the playground.（2） 当主语为第三人称单数时，要用doesn\\\\'t构成否定句, 主语+ doesn\\\\'t +动词原形(+其它)。He/ She goes to school at six in the morning. (变否定句)→He/ She doesn\\\\'t goto school at six in the morning.（1）当主语是第一，二或复数时，do +主语+动词原形+其它。 I often play football.→Do you often play football?---- Yes, I do. / No, I don\\\\'t.(2) 当主语为第三人称单数时，does+主语+动词原形+其它。She goes home at five every day.→Does she go home at five every day?---- Yes, she does./ No, she doesn’t.
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