回答：此句虽不完整,但句意是：我在此发言,同意/赞成...(某人/某事).这句不是在in favor of 前面加speaking,I am speaking是指说话者正在发言；而介词短语in favor of意为：有利于；支持；赞同.

又如：Perhaps the judge would rule in favor of me.
或许法官会就此做出有利于我的裁决.
People are surprised to learn that the so-called "liberals" are not in favor of freedom.
令人感到诧异的是,那些所谓的“自由主义者”居然不赞同自由.
Some people are in favor of reform, and others have concerns.
一些人赞同进行改革,而另一些人心存疑惑. 欢迎提问,乐意解答；愿你满意, 望你采纳.