Could you tell me if both of the sentences below are correct? Thank you.
A) I may not know which one is Tony.
B) I may not know which one Tony is.
I'd personally use "I may not know which one is Tony"
The second sounds strange, but I assume it to be correct as well. However, it sounds like there are more than one Tony to choose from.
***** NOT A TEACHER *****
(1) We non-teachers are currently allowed to answer questions if
we start with a disclaimer ("Not a teacher") and write in a very
respectful and humble manner.
(2) I found your question most interesting.
(3) I submitted the following sentences to someone who knows
English very well:
(a) I do not know which one is Mona.
(b) I do not know which one Mona is.
(4) That person told me that it is generally agreed that (b) is
the "correct" answer. That is, in noun clauses, the subject and verb
usually follow "regular order." (Yes, there are exceptions -- in
informal language or when the noun clause is very long.)
(5) Please remember, Lisa, that if a non-teacher's opinion differs
from a teacher's opinion, you should always accept the teacher's
opinion as the correct one.