一、 单数第三人称的七种常见形式

1、主语为单数可数名词：

This computer is yours.

That dress is red.

2、主语为不可数名词：

The soup is very hot.

The water is in the glass.

3、主语为三个人称代词：he, she, it

He likes playing computer.

She has lunch at home.

It looks a baby.

4、主语为两个指示代词：this, that

This is a eraser.

That is an apple.

6、主语为人名、地名、称呼：

Tianjin is in China.

Rose looks like her mother.

Mother often makes cakes.

6、主语为数字或字母：

'C' is a letter.

'9' is a number.

7、主语为八个不定代词：someone, somebody, something, everyone, everybody, everything, nobody, nothing

Everyone is here.

Nobody knows this person.

There is something wrong with the computer.

二、单数第三人称动词的变化规则

1、直接在动词后面加 s

say-says, read-reads, write-writes。

2、以 ch, sh, s, x, o 结尾的动词+es

do-does, touch-touches, wash-washes;

wish-wishes, guess-guesses, fix-fixes。

3、以辅音字母 +y 结尾的动词，把y变为i再+ es

study-studies, try-tries, carry-carries, fly-flies, cry-cries, worry-worries。

4、特殊变形：

have：主语是第三人称单数时，要改用has。

He has a watch. 她有一个苹果。

三、动词三单的否定、一般疑问句、特殊疑问句的句型变化

1、动词第三人称单数形式的句子变否定句：doesn't + 动词原形

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

2、动词第三人称单数形式的句子进行提问时，要用助动词 does

He goes home at seven every afternoon.（一般疑问句）

Does she go home at five every aternoon.

She goes homeat sixevery day.（对划线提问）

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