作为一个代表英文

be a genuine representative of English class.

be the representative of

对啊 behalf 不能做动词滴吧 whoever is out of office 这个偶认为是对的

When A, B, and C are out of the office, D will act on their behalf.Provisional 有些多余却个动词 act act on their behalf 是常见的短语 ~~~~~~~~~~~~~那就用or来连接A B C 好些，不过后半句也得改了你想说provisional 什么来着？临时办公室主管还是怎么？我不太明白你这个句子了，“作为他们的代表人”是指定的代表人还是可以替他们做什么指定的事？ 就是说，英文要翻成 will 或 must 必须的语气，还是 could 可以、有权的语气呢？When A, B, or C is out of the office, D will act as the provisional XXX. When either A, B, or C is out of the office, D could as on his or her behalf.

Whoever of A,B,C is out of office, D can behalf him provisional 如果是三个都不在，才这样做：whenever A,B,C are all out of office, D can behalf them provisional.