Question

change into passive - he had written five books by the time he was 20 years old

Answer 1

Hello mate,

Here is your answer,

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He was 20 years old when he had written 5 books.

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HOPE THIS HELPS UU :)

AND STAY BLESSED.

Answer 2

Heya!!!

Answer to your question:

♡Five books had been written by him by the time he was 20 years old.

Hope it helps ^_^