Question

they are breeding grounds for the germs question tag​

Answer 1

Answer:

They are breeding grounds for the germs aren't they? The auxiliary verb is referred as the verb which adds the grammatical or functional meaning to that clause in which the verb appears

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Answer 2

Explanation:

Hence the statement after adding the question tag must be following - They are breeding grounds for the germs aren't they? The auxiliary verb is referred as the verb which adds the grammatical or functional meaning to that clause in which the verb appears