I don't think I can comment on his decision.
这个可能是个固定搭配,但为什么就是on呢?
我想知道这里为什么一定要用介词on?感谢!
根据英语词汇搭配用法,动词 comment 后面可以接的介词有 on,about 和 to 等。具体用法需要根据表达的意思来决定。例如:
comment about ... 评论有关......的事 People were commenting about her abilities. 人们在评论她的能力。
comment on ... 评论...... He refused to comment on the proposals. 他拒绝对这些建议发表意见。
comment to ... 向......发表意见 She commented to me that she liked it . 她对我表示喜欢它。
(以上摘自《牛津英语搭配词典》第2版)