中学教師は部活動の指導をしなければならない。って英語でなんて言うの？

「中学教師は部活動の指導をしなければならない」＝ Junior high school teachers have to get involved in extra-curricular club activities. / Junior high school teachers also have to lead after-school club activities. / One of the jobs of a junior high school teacher is to lead after-school club activities.

ボキャブラリー
junior high school teacher ＝　中学教師
have to ～　＝　～しなければならない
get involved in ＝　参加する
extra-curricular club activity, after school club activity ＝　部活
lead ＝　指導する
one of the jobs ＝　仕事の一つ
also ＝　～も