Chapter 15 - Speculating about things
We can speculate about the possible outcomes of events which have already occurred, or propose consequences for events which are possible. This tense is formed by taking the stem from the io form of the imperfect past tense, and adding the endings for each group.
Group 1 verbs end in -are.  The io form  of the imperfect past tense of parlare is parlavo.  The  stem is parl-, and the ending is -avo.  The ending  is dropped, and the stem (parl-)is used to  form the past subjunctive.
| I | io | parl + assi | parlassi (pahr-lAH-see) | 
| you | tu | parl + assi | parlassi (pahr-lAH-see) | 
| he, she, who | lei, lui chi | parl + asse | parlasse (pahr-lAH-see) | 
| we | noi | parl + ạssimo | parlạssimo (pahr-lAHs-simo) | 
| you | voi | parl + aste | parlaste (pahr-lAHs-tay) | 
| they, who | loro, chi | parl + ạssero | parlạssero (pah-lAHs-say-roh) | 
In group 1, there are no irregularities. The verbs dare, fare, stare, and their compounds are part of group 2. Their stems are d-, fac-, st-. Esample: dessi, facessi, stessi.
Group 2 verbs end in -ere or -rre.   The io form of the imperfect past tense  of credere is credevo.  The stem is cred-, and the ending is -evo.  The  ending is dropped, and the stem (cred-) is used for the past  subjunctive.
| I | io | cred + ẹssi | credẹssi (cray-dAYs-see) | 
| you | tu | cred + ẹssi | credẹssi (cray-dAYs-see) | 
| he, she, who | lei, lui chi | cred + ẹsse | credẹsse (cray-dAYs-say) | 
| we | noi | cred + ẹssimo | credẹssimo (cray-dAYs-see-moh) | 
| you | voi | cred + ẹste | credẹste (cray-dAYs-tay) | 
| they, who | loro, chi | cred + ẹssero | credẹssero (cray-dAYs-say-roh) | 
In group 2, the following  verbs are irregular in the past subjunctive.
              ęssere, to be:  fọssi,  fọssi, fọsse, fossimo, fọste, fọssero
              rięssere, to  be again:  rifọssi,  rifọssi, rifọsse, rifossimo, rifọste, rifọssero
Group 3 verbs end in -ire.  The imperfect past tense of finire is finivo.  The stem is fin-, and the ending is -ivo.  The  ending is dropped, and the stem (fin-) is used to form the past  subjunctive.
| I | io | fin + issi | finissi (fee-nEEs-see) | 
| you | tu | fin + issi | finissi (fee-nEEs-see) | 
| he, she, who | lei, lui chi | fin + isse | finisse (fee-NEEs-say) | 
| we | noi | fin + ịssimo | finịssimo (fee-nEEs-see-moh) | 
| you | voi | fin + iste | finiste (fee-nEE-tay) | 
| they, who | loro, chi | fin + ịssero | finịssero (fee-nEEs-say-roh) | 
  In group 3, there are no  exceptions to the rules, but dire and its compounds are part of group  two.Its stem is dic-. Example: dicessi.
The past subjunctive in  English is formed by the use of may have, might have, had,  or were.  Some example are   Had I the money, I would go to Italy.        Se avessi il denaro, andrei in italia.
  It  would be nice if I were able to speak Italian.         Sarebbe buono se io potessi parlare italiano.
  Who  knows what might have happened?                Chi sa che potesse avere successo?
              Life would be easy if we were rich.              La vita sarebbe  fạcile se fǫssimo rici.
              If I had studied, I would be a doctor.          Se io avessi studiato,  sarei dottore.