✨ ベストアンサー ✨
(ア)
I was (good at playing soccer when) I was a school student.
(イ)
Kumi, (what are you looking for)?
(ウ)
This (is a book read by) a lot of children.
This (is a book read to) a lot of children.
(エ)
I use (the guitar my father gave) to me.
丁寧にご回答ありがとうございます🙇🙇