this is 后加"a pen "还是"pen ",为什么"this is paper"可以不加?"these are scissors"可以不加?请说明一下冠词应在什么情况下加吧,

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this is 后加"a pen "还是"pen ",为什么"this is paper"可以不加?"these are scissors"可以不加?
请说明一下冠词应在什么情况下加吧,

在单数可数的情况下都可以加 |"a",或者"one"...
例：this is a pen.
this is a pen.
在形容不可数名词的情况下定冠词可省略,即不可加“a”与任何表示数量的词

例： this is water
or:this is the water
在复数的情况下（即该东西数量大于1以上）也省略定冠词
例：these are pens.
或者 these are two pens.
)___________________________
补充：this is 与 these are 都是"这是."的意思,区别在于前者形容单数,后者形容复数
that is与 those are "那是."的意思,同理..

this is 后加"a pen ",因为pen是可数名词,而paper和scissors都是不可数名词

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冠词的用法讲一天讲不完的,我就你这个问题讲一下.
首先This is a pen. 因为pen是可数名词,当你表示单数的时候,必须加冠词(又因为是介绍性语句,所以不是特指,用a)
而This is paper.中paper不是可数名词,所以不存在单复数问题,这个时候不能够加a(不能说一个纸,只能是一张纸)
There are scissors. 这里首先scissors同trousers一样,总是要成双成对的出现(没有一个裤筒的裤子吧?),所以这里就是复数形式,不能加a.纵然要说"一把剪刀"也是a pair of scissors,加量词.
总之a得加在单数可数名词前,复数\不可数名词前不能加.

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不定冠词a和an 一般用在可数名词前。
而定冠词the 可加在可数的和不可数的名词前。

加"a pen "。this is paper：paper是不可数名词。
these are scissors：these are是复数。
在单数，可数名词后加（不包括定冠词）

this is 后加a pen 还是pen ,为什么this is paper可以不加?these are scissors可以不加?请说明一下冠词应在什么情况下加吧, This is my a pen?对还是This is a my pen?对This is my pen？ What is this 是This is a pen.还是.It is a pen?为什么? what is that in English?是It is a pen还是This si a pen还是That is a pen This is a pencil and a pen还是These are a pencil and a pen what is this It is a pen.还是This is a pen好这个问句碰到选项,该选哪句? this is a my pen This is a nice pen. 是This is my blue pen 还是This is my a blue pen有助于回答者给出准确的答案 This is a pen.(this)are pencily This is a pencil and a pen还是This are a pencil and a pen,二楼说的也许对，但我只问用IS还是ARE This a pen.that is a pen,什么 This is a pen.就划线提问 this is a pen.改为复数句 this is a pen改成一般疑问句 This is a pen.改为一般疑问句 is this a youe pen 怎样改错 This is a nice pen.的问句