I believe this is from the Anne Frank annex. So a conflict she has to face every single day is hiding from those taht want to kill the Jews. Like she can’t flush at certain times of the day and she can get in trouble if she makes one wrong move. And that’s what happened she ended up getting killed which is so sad and hesat breaking that Jews have to go through that.
The answer is "could have forgotten" since you is the subject, you wouldn't include that in the verb phrase.
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