+0
1. What are you talking about?
2. About what are you talking?

3. What are you turning on? (air conditioner)
4. On what are you turning?

Q) I intuitively know that #4 is incorrect while I think #2 is correct. Am I correct?
1 2
Comments  (Page 2) 
in response to louiST post:You cannot use "who" after a preporsition such as "with." With whom is she dancing? is correct, albeit formal. In casual conversation, you would say "Who is she dancing with?"
You started a sentence with the word but... Shhhhh ;P
Students: Are you brave enough to let our tutors analyse your pronunciation?

technically "about what are you talking" is correct while "what are you talking about" is incorrect

jacobjac5

technically "about what are you talking" is correct while "what are you talking about" is incorrect

Maybe you don't realize it, but you are answering a question that was asked about eight years ago.

Why not answer questions that are more recent? That way there's a better chance that the person who asked the question is still participating on our forum and can benefit from your answer.

You should also note that your answer is wrong. Please be sure you've checked your grammar books before answering questions.

CJ

Ending a word with a preposition was grammatically incorrect and if you didn't know "about" is considered a preposition but now it is ok to end a sentence with a preposition, as I said in my comment,

technically... "what are you talking about" is incorrect

and why are you scrolling through an 8 year old question too?

Students: We have free audio pronunciation exercises.
jacobjac5Ending a word sentence with a preposition was grammatically incorrect

No, it's not incorrect to end a sentence with a preposition, as you hint at with 'technically'. (Students are still being told very strange and wrong things that used to be taught 100 years ago.)

Anyway, it's "about what you are talking" that's wrong. It should be "about which you are talking".

jacobjac5 why are you scrolling through an 8 year old question too?

I'm not scrolling through old threads. I'm a moderator, so I'm notified about posts like these so I can check them out. You can post to old threads, but there really isn't any point to it because no one is likely to read them except moderators, especially not someone from eight years ago. Turnover is high, and students seldom stay with us for more than a year.

CJ