Question

Mother was not at home (add was question tag)

Answer 1

Heyaa..

Mother was not at home, Wasn't she?

# Positive sentence will have a negative question tag

# The question tag will end with the pronoun given in the sentence...

EXAMPLE :

It is raining, Isn't it?

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Hope it helps...

And here CutieBarbie :)

Answer 2

The answer is..
Mother was not at home, was she?

If the sentence is negative then the question tag has to be positive.