Are you talking about a specific quiz?
It's simply because the lesson is about the pronoun "y". You're supposed to practice its use.
In general, you are doing something very tempting when learning a foreign language, but something you can never do: you can never take an English sentence, translate each word with a dictionary, and end up with a correct foreign-language sentence. That's just not how grammar works. Foreign languages not only have different lists of words--they have different ways of putting words together into sentences.
There is a famous book where someone tried to go the other way: he took French sentences and looked up the matching English words in a dictionary. The results were pretty comical:
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Test your French to the CEFR standard