How to ask about if there is something for tomorrow
Will be there classes tomorrow?
Will there be classes tomorrow?
Will classes be there tomorrow?
Will classes are there tomorrow?

I don't know how to ask that, please help!

Question

How to ask about if there is something for tomorrow
Will be there classes tomorrow?
Will there be classes tomorrow?
Will classes be there tomorrow?
Will classes are there tomorrow?

I don't know how to ask that, please help!

Answer

"Will there be classes tomorrow" is correct to ask if classes will be  held or not.  Numbers 1 and 4 are grammatically incorrect.  Number 3 means something different from what you're asking.  "Will classes be there tomorrow?" questions the location of the classes, not if they will happen or not.  For example, if  your teacher has been mentioning a class-visit to a local park, you could ask "Will classes be there [meaning the park] tomorrow".

Answer

Will there be classes tomorrow is the correct one to use.

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