To use the verb "знать" (which means "to know") in a conditional way, follow these easy steps:

1. Past Tense of "знать":

   • For one person:
     • Я знал (I knew - for guys)
     • Я знала (I knew - for girls)
   • For more than one person:
     • Мы знали (We knew)

2. Using "если" (if): You can add "если" when talking about things that could happen or things that might have happened.

3. Examples:

   • Если бы я знал, я бы помог. (If I had known, I would have helped.)
   • Если бы я знала, я бы решила. (If I had known, I would have decided.)

Try using these examples to practice talking about "what if" situations with "знать."