1. 그런데, 너는 여기 왜 왔니?

     By the way, Why are you here?

=>  By the way, why are you here?​  (Pay attention to the capital letters and spaces required in sentences.​)

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2. 어제 뭐 했니?

     What did you do yesterday?  ✔

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3. 놀이 공원에 갔었어. 사진 엄청 많이 찍었어. 내가 보여줄께.

    I went to an amusement park. I took a lot of pictures. I'll show you.  ✔​

​• Corrected: The sentences are corrected grammatically.​