You should turn it into an assertion because then with your essay or whatever you're using to back it up, you can affirm that your thesis statement is true/correct or w/e
Answer:
SONG IS SUNG BY WHOM?
Explanation:
S⇒ who
V⇒ sings
O⇒ song
In passive voice
→If subject is who it changes to <em>by whom.</em>
- by is added before object
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