A : He was murdered
B : By who? / By whom? / Who by? / Whom by?
By whom was America discovered?
Who was America discovered by?
In the first example, I chose 'by who' or 'by whom'.
In the second example, I prefer the second.
Could you please tell me your opinion?
Last edited by aysaa; 01-Oct-2012 at 20:29.
I have always seen this expanation from the teachers on net such as (by) who / whom ...? [question using passive voice] - WordReference Forums
By whom was the book written? (extremely formal)
Who was the book written by? (everyday speech and writing).
Last edited by aysaa; 02-Oct-2012 at 11:43.