i donts have a sister还是i dont have sister

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i donts have a sister还是i dont have sister
i donts have a sister还是i dont have sister

i donts have a sister还是i dont have sister
i donts have a sister正确.你的问题牵扯名词表类别问题.
a/an加可数名词单数
A cat is a domestic animal.猫是家养动物
零冠词加可数名词复数
Cats is domestic animals.
the表示人或事物的类别
The cobra is dangerous.眼镜蛇是危险的
If you park your car in the worng place,a traffic policeman will soon find it.一旦你把汽车停错了地方,交警很快就会发现.

I don't have a sister.

是I don't have a sister,sister是可数名词,单数时要加a

I don't have a sister
don't属于助动词do的否定形式。没有第三人称单数形式。
sister作为可数名词前面要加定冠词a,或者用复数形式sisters.

I have no sister .