Question

why_____your brother sad?(was/were)​

Answer 1

Answer:

Was

Explanation:

Why was your brother sad is correct answer...

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Answer 2

Answer:  Why was your brother sad?

Explanation:

Was and were are both used in the past tense.

But, was is used in the first person singular (I) and the third person singular (he, she, it).

Were is used in the second person singular and plural (you, your, yours), as well as the first and third person plural (you, yours, yours) (we, they).