名词做主语的几种情况比如说“名词复数”啊,“the+名词单数”啊之类的.

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可数名词：泛指/类指/表示类别
the +名词单数
a +名词单数
零冠词+名词复数
The horse is a useful animal.
A horse is a useful animal.
Horses are useful animals.
不可数名词：泛指/类指/表示类别
原形Water is very important to us hman beings.
特指：可数名词：the+单数 The car over there is made in China.
the+复数 The teachers here all work very hard.
不可数名词：
the+原形 The water here has been polluted.