The author's purpose for writing the passage is most likely to <u><em>inform, educate or argue</em></u>
The question is incomplete, but i will try my best to give you a general overview that will help you get to the correct answer.
The purpose of an author for writing a book could be to:
Therefore, to find the purpose of an author in a book, you have to first:
- Understand the main idea
- Check out the supporting details
- Identify the moral lesson the author is trying to give. <em>For example</em>, if an author is writing about the dangers of bush burning, then the most likely purpose would be to <em>educate about the dangers of bush burning</em>
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It's useful because it gets you ahead in class. If you read ahead you are more likely to understand what your professor is teaching. It also helps if you unexpectedly get a large amount of homework. If you have read ahead it allows you to have more time doing labs or essays.
D. the photographs had been taken by a friend of my grandfather's.
It is in the passive voice because the subject "photographs" is receiving the action which is "taken"