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,
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 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