Question

change into voice“ oranges are sour”​

Answer 1

There is no passive voice of most of the sentences ending with a complement, unless you do it forcefully. Here, I could perceive that there cannot be any passive form of the given sentence.

Rather, if it would have been oranges are sour it could make a quasi-passive voice of the same,

It will be

Oranges are tasted sour.

Answer 2

Hey Mate!!

Oranges are sour when tasted.

I hope it helps.

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I am happy to help you.