Yes, it can, depending on the word. Prefixes, however, almost never change the root word. The most common changes of a root when adding suffixes are the removal of a final E that follows a consonant (e.g. diving), or the change of a Y to an I (e.g. silliness).
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I don't think there is an error.
If there is, it's the 3rd option.
Answer:
The Dursleys didn't have a direct conversation on this matter in the book. But when hagrid came to pick up Harry, and tells him about his parents then Harry mentions that the Dursleys have told him that his parents died in a car crash.
The reason I think they kept him in the dark is pretty obvious, that they hated the magic world, pretty much because of Petunia, as she was jeoulous that her sister (Harry's mother) was a witch and got admitted to Hogwarts and she didn't and they wanted to keep Harry away from that as they didn't want anymore of that "nonsense" and wanted to live a happy ordinary life.
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Answer:
maybe it could be family or he did something wrong and doesnt want to tell you.
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