Question

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We have mathematics today. 
I have a sister. 
My friends has English books. 
They had friends in Moscow.

Answer 1

We have mathematics today. Have   we mathematics today?
We haven"t mathematics today.
I have a sister. Have  I a sister? I haven"t a sister.
My friends has English books. Has  my friends  English books?
 My friends hasn"t English books. 
They had friends in Moscow. Did they have friends in Moscow?They did"t have friends in Moscow.