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Help the nosy neighbor politely interrogate the mail carrier about the new resident. Select ALL the sentences that are grammatically correct indirect questions!
The correct answers are I was wondering what he is building back there. and Do you know why he bought so much lumber?
In indirect questions, the word order changes from question format (Verb-Subject) to statement format (Subject-Verb).
Therefore, "what is he building" becomes "what he is building". Additionally, we drop auxiliary verbs like do, does, and did in the indirect part, so "why did he buy" becomes "why he bought".