General truths and general habits ZERO CONDITIONAL If + present simple, present simple If you add two and two, you get four. Possible or likely things in the future If + present simple, will + infinitive If it rains later, we'll stay at home. FIRST CONDITIONAL CONDITIONALS­english­grammar.com SECOND CONDITIONAL Impossible things in the present / unlikely things in the future If + past simple, would + infinitive If I won the lottery, I would sail round the world. Things that didn't happen in the past and their imaginary results If + past perfect, would + have + past participle If I had studied harder, I would have passed the exam. THIRD CONDITIONAL