Rule reminder

Advanced mixed conditionals freely combine time frames: (1) Past condition → present result: se + congiuntivo trapassato + condizionale presente; (2) Present condition → past result: se + congiuntivo imperfetto + condizionale passato (rarer but possible); (3) Double mixed: present condition + future result using futuro; (4) Modal + mixed: poter/dover in either clause with appropriate forms.