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  • Thanks!

  • Very simple, "Don't you know how to do this?"

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    • Please explain to me, I don't know if there is any rule about this.

      Why don't we use "Question word (How) + Auxiliary (do)+ Subject  +  Verb .. " ?

    • Question when we use HOW:

      How many boys and girls are there in the class?

      Quention when we use DO:

      Do you know how many boys and girls are there in the class?

      HOW

      How much water have passed under the brdige Thames?

      Your query is with some abiguity.  Hope my explanation is helpful to you.

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