1) Who will operate on him?
谁给他动手术？
2) It's necessary to operate on him.
必须给他做手术。
3) Who's going to accompany him on the piano?
谁给他钢琴伴奏?
4) Who granted them the authority?
谁给他们的权力！
5) Who does he give a pen to ?
他给谁一支钢笔?
补充资料：必须
①表示事理上和情理上的必要；一定要：学习～刻苦钻研。②加强命令语气：明天你～来。‖‘必须’的否定是‘无须’、‘不须’或‘不必’。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条