subordinate clause introduced by si or nisi and contains a condition
apodosis
main clause which states what is true if the condition of the protasis is fulfilled
future more vivid
seen as a certainty, or at least very likely; future or future perfectindicative used in both parts
future less vivid
should-would conditions; may or may not happen; uses present subjunctive in both parts (future in apodosis if action is completed); implies uncertainty
contrary-to-fact
protasis is contrary to known facts or impossible; implies protasis did not happen and cannot happen now; subjunctive (imperfect for continuation, pluperfect for completion)
simple conditions
indicative; no implications; protasis is indicative; apodosis can be imperative, indicative, or subjunctive
