Question

the baby ate up all the cake change into passive voice​

Answer 1

Answer:

All the cake was eaten up by the baby.

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Answer 2

Here is the correct answer:

All the cake was eaten up by the baby.

Explanation

The verb in the sentence was Simple Past in the active form (ate). When we convert the active voice of Simple Past into passive voice, we use passive form equivalent to the active form. The active form in Simple past is 'V2' or Simple Past form of the verb. The object is made the subject and vice versa; 'by' is added. The passive form in Simple Past is was/were +V3.