no matter when and where it is 为什么加 IT IS?About the cell,I thought that I need communicate with others no matter when and where it is,so it is very important for me .no matter when and where 后为什么加 IT IS?

no matter when and where it is 为什么加 IT IS?About the cell,I thought that I need communicate with others no matter when and where it is,so it is very important for me .no matter when and where 后为什么加 IT IS?
no matter when and where it is 为什么加 IT IS?
About the cell,I thought that I need communicate with others no matter when and where it is,so it is very important for me .
no matter when and where 后为什么加 IT IS?

no matter when and where it is 为什么加 IT IS?About the cell,I thought that I need communicate with others no matter when and where it is,so it is very important for me .no matter when and where 后为什么加 IT IS?
no matter when and where it is整个是 让步状语从句
其实是 no matter it is when and where,从句采疑问词提前变为
no matter when and where it is
it是代词 指代 “情况”,因为句子是说明在两种情况下
而从句必须是一个句子,所以结构和意思需要加 it is

不加没主语了，形式主语呐

no matter 的用法
no matter作“无论”、“不管”解，用以引导表示让步的状语从句，常用在下列句型中： 句型中的No matter what (who/when etc.)...分别表示“无论何事”、“无论何人”、“无论何时”等，这个从句可以置主句之前，也可以置主句之后。
由no matter + what等引导的让步状语从句。No matter后面接关系代词或关...

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no matter 的用法
no matter作“无论”、“不管”解，用以引导表示让步的状语从句，常用在下列句型中： 句型中的No matter what (who/when etc.)...分别表示“无论何事”、“无论何人”、“无论何时”等，这个从句可以置主句之前，也可以置主句之后。
由no matter + what等引导的让步状语从句。No matter后面接关系代词或关系副词引导状语从句在句中作让步状语。
No matter what you do, you must be very careful.不管做什么事，你都必须非常细心。
No matter之后可用what以外的关系代词或关系副词。例如：
No matter who you are (=Whoever you are), I’ll never let you in.无论你是谁，我绝不让你进去。
No matter which…无论哪一个……
No matter which you choose(=Whichever you choose), you will be satisfied.不论你选择哪一个，你都会满意的。
No matter where…无论何处；不管在哪里……
No matter where I go (=Wherever I go) , I will be thinking of you. 无论我到哪里，我都会想着你。
No matter when …无论何时，不管什么时候……
I’ll discuss it with you no matter when you like(=whenever like). 你什么时候高兴，我愿意同你讨论这件事。
No matter how..不管……如何；无论……多么……
No matter how hard you try(=However hard you try), you will never be successful. 不管你如何努力，你都不会成功的

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因为它们后面缺宾语和谓语,形成一个陈述句式.使句子结构完整.这是一个让步状语从句