Conditionals

General truths and general habits. If+present simple.

If you add two and two, you get four.

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Possible or likely things in the future. If+present simple, will+infinitive.

If it rains later, we'll stay at home.

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Inpossible 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.

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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.

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