单数第三人称动词用法及变化规则 动词第三人称单数变化规则是什么？
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\u5982\uff1aI kiss\uff0che kisses\uff1bI fix\uff0che fixes\uff1bI wash\uff0che washes\uff1bI watch\uff0che watches\u3002
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单数第三人称动词用法及变化规则如下：
用法：
简单概括就是，在一般现在时的时态中，当句子的主语是第三人称单数时，谓语动词要用第三人称单数形式。具体用法有以下几种情况：
（一）遇到人称代词it、he、she时：
例：It looks nice. 它看起来很漂亮。
He often has breakfast at seven. 他经常在早上七点吃早餐。
She likes dancing. 她喜欢跳舞。
（二）单个人名、地名或称呼作主语时：
例：Li Lei looks like his father. 李雷看起来像他爸爸。
Fu jian is in China. 福建在中国。
Uncle Zhan often makes cakes. 詹叔叔经常做蛋糕。
（三）单数可数名词或“this/that/the+单数可数名词”作主语时：
例：An apple is on the desk. 有一个苹果在桌上。
This car is black. 这辆车是黑色的。
That book is yours. 那本书是你的。
The cat looks so cute. 这只猫看起来真可爱。
（四）不定代词someone、somebody、nobody、everybody、something、everything等，以及指示代词this、that作主语时：
例：Everyone is here. 大家都在这。
There is something wrong with the watch. 这块表有点毛病。
This is an eraser. 这是一块橡皮擦。
（五）不可数名词作主语时可看作第三人称单数：
例：The bread is very small. 这个面包很小。
（六）当数字或字母作主语时可看作第三人称单数：
例："6" is a lucky number. 6是个幸运的数字。
"A" is the first letter. A是第一个字母。
（七）含有动词第三人称单数形式的句子变成否定句时，要用doesn’t+动词原形：
例：He goes to school at seven in the morning.
→ He doesn’t go to school at seven in the morning.
（八）对含有动词第三人称单数形式的句子提问时，要用助动词does，并且动词变为原形：
例：She often goes home at five in the afternoon.
→ When does she go home in the afternoon?
变化规则：
（一）一般情况：大多数动词都是直接在原形后+s，例：come-comes keep-keeps
（二）以s、x、ch、sh和o结尾时，在动词原形后+es，例：pass-passes fix-fixes teach-teaches go-goes
（三）以辅音字母+y结尾的动词，变y为i+es，例：try-tries study-studies
（四）以元音字母+y结尾的动词，直接在动词后+s，例：play-plays
（五）特殊情况：动词have，遇到主语是第三人称单数时，变have为has；be动词的第三人称单数形式是is。
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