I must say I am lost on what we are talking about here. (source : https://books.google.co.kr/books?id=PTLSAAAAMAAJ&q=%22am+lost+on+what%22&dq=%22am+lost+on+what%22&hl=ko&sa=X&redir_esc=y)
Is this sentence grammatically correct?
fire1 I must say I am lost on what we are talking about here. Correct. I must say (that) I am lost on [ what we are talking about here].
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fire1I must say I am lost on what we are talking about here.
Correct.
I must say (that) I am lost on [what we are talking about here].
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I must say (that) I am lost concerning [the thing that we are talking about here].
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I must say