Conditional sentences

CONDITIONAL SENTENCES:

TIPE 0:

Universal, general truths                                        If+s+present simple, s+present simple    

TIPE 1:

Possible conditions                                                 Unless/If+s+present simple, s+will+ inf+complements

TIPE 2:

hypothetical, improbable conditions                  If+s+past simple, s+would+inf+complements

TIPE 3:

impossible conditions (past)                                If+s+past perfect, s+would have+participio