Advanced Conditionals: Were To, Should, Had

Inverted conditional forms.

Examples

• Had I known, I'd have called.

Key rules

• Were to + verb: unlikely future: If he were to leave...
• Should + verb: unlikely or polite: If you should need
• Had + participle: inversion in the third conditional
• Inversion drops if

Common mistakes

• If he would to win, → If he were to win,
• Had I known, I would have come
• Should you need help, call me