⇔ They were taught Japanese by Kyoko.
⇔ Japanese was taught to them by Kyoko.
京子は彼らに日本語を教えた。
Kyoko taught them Japanese.
⇔ They were taught Japanese by Kyoko.
⇔ Japanese was taught to them by Kyoko.
⇔ They were taught Japanese by Kyoko.
⇔ Japanese was taught to them by Kyoko.
