自分の部屋の掃除をしている時に,私は父にもらった本を見つけた。
(given // my room, / found / cleaning / a book) by my father.
(I) cleaning my reem, I found given a book by my father.
彼の住所を知らなかったので,私は彼に手紙を書けなかった。
(address, / couldn't/ not/1/knowing / his ) write to him.
I ) not knowing his address, I couldn't
write to him.