Second Conditional

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First Conditional

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• If it doesn't rain tomorrow, we'll go to the beach.

• Arsenal will be top of the league if they win.

• When I finish work, I'll call you.

We use the first conditional when we talk about future situations we believe are real or possible.

In first conditional sentences, the structure is usually: if/when + present simple >> will + infinitive. It is also common to use this structure with unless, as long as, as soon as or in case instead of if.