Question

change into passive voice
1 - Sita has eaten the cake
2-They were serving the guest
3-Do it
4-Alexanded attacked India ​

Answer 1

do it yourself

It will improve your knowledge

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Answer 2

Answers:
1) The cake has been eaten by Sita.
2) The guest was been served by them.
3) You do it. (Implied you)
4) India was attacked by Alexander.

Hope it helps.