第一人称:I We (我、我们)
第二人称:you(你、你们)
第三人称:she、he、it、they(他、她、它、他们)
非你非我非复数即三单。
Tina✔︎
my teacher ✔
the dog ✔
they ✘
my teachers ✘
dogs ✘
I We ✘
You✘
在一般现在时中，当主语是第三人称单数时，谓语动词要也用相应的第三人称单形式。
①第三人称单数做主语:He、she、it
He plays football everyday.
She plays the piano every day.
It is a dog.
②单个专有名词作主语:地名、人名、国家、城市。
Nina is an English teacher.
China is very large.
③单数名词或tjis/that/the+单数名词作主语
The book is expensive.
That girl runs every day.
④形容词物主代词+单数名词做主语
EG:our classroom
your bike
my mother
Nina's book
My mother is an English teacher.
⑤单种不可数名词作主语
Milk is good for us.
Much imformation affectss our judgment.
⑥复合不定代词以及指示代词this/that作主语:
something/somebody/someone
anything/anybody/anyone
nothing/nobody/no one
everything/everybody/everyone
Something is wrong with my watch.我的手表出问题了。
Nothing is difficult in the world if you put your heart into it.如果你用心去做，世界上没有什么是困难的。
This is an English book.这是一本英语书
⑦疑问代词作主语常用三单，具体还要结合语境:
What/Who/Which
What has happened?发生了什么事？
Who wants to go together?谁想一起去？
①一般情况下，在词尾后面加-s
write→writes like→likes
get→gets live→lives
stay→stays play→plays
buy→buys pay→pays
(以元音字母+y结尾，直接加-s)
②以+s,-x,-ch,-sh,-o结尾的单词:在词尾加-es
pass→passes fix→fixes
teach→teaches wash→washes
go→goes do→does
③以辅音字母+y结尾的单词:变y为i再加es
carry→carries study→studies
worry→worries fly→flies
④特殊情况
have☞has
be☞is
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