(１)は
May I ask him how the concert was.
だと思うのですが、"he"のつかいどころがわかりません😱
ごめんなさい💦
(４)は
This room must not be used by the students.
だと思います(*^^*)
(追加した語は"be"です)
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ありがとうございます！！
助かります😭