Question

i (not park) in the street if I (know) there were car thieves in the area.

Answer 1

I won't park in the street if I knew there where car thieves in the area.

Answer 2

wouldn't park / knew
 

Answer 3

i (not park) in the street if I (know) there were car thieves in the area.                           ⇒I won't park in the street if I knew there where car thieves in the area.

Answer 4

I won't park in the street if I knew there where car thieves in the area.

Answer 5

I wouldn't park on the street if I knew there were car thieves in the area 

Answer 6

wouldn't park / knew