Idha - for fulfillable conditional
اذا
  • follow by past tense verb in condition and response
  • negate with lam, then maa
  • start response with fa particle if it is not a basic verb
Inn - also something quite fulfillable
إن
  • follow by past or present
  • negate with lam, and then lan
  • start response with fa particle if it is not a basic verb
Low - unachievable things
لو
  • start response with la
  • follow by past

اذا اجتهد نجح
ان تجتهد تنجح
لو اجتحد لنجح