Joanna asked me if i (1)... (know) dave clack. I replied i (2)...(know) him for many years and asked her why she (3)... (want) to know, then i (4)... (known)

(1) know
(2) if i knew
(3) would want
(4) i have known

This topic about indirect speech.
Actually, there is a conversation between Joanna and I in direct form.
Furthermore, we should change the tenses, the subject and the adverb of time.
My answer:
(1) knew
(2) had known
(3) wanted
(4) knew