Question

さ~~や

①は受け身なんですけど、なぜ、toが入るのか教えてください！

6 受け身 (受動態)
① This singer is known to everyone.
Mary is interested in Japanese culure.

ェ wos helped by Mr. Yamamofo los+ week.

This letter isn † written in JapaneSe.
Ts this rootw c

②
③
る⑧                                               e               ォ   ェ
⑤                    leaned every nornin9? - Yes,けjs.
⑥ Where wos +his bag found?