Si dejo la leche fuera, se daña rápido.

If I leave the milk out, it goes bad quickly.

Breakdown of Si dejo la leche fuera, se daña rápido.

• yo: I
• si: if
• la leche: the milk
• dejar: to leave

Questions & Answers about Si dejo la leche fuera, se daña rápido.

Why does it use dejo (present tense) instead of dejé (past) or dejaré (future)?

In Spanish, an if clause with si + present indicative often expresses a general result or a typical consequence:

• Si dejo la leche fuera, se daña rápido. = Whenever/if I leave the milk out, it spoils quickly.

You can make it clearly future:

• Si dejo la leche fuera, se dañará rápido. (If I leave it out, it will spoil quickly.)

And you’d use past if you’re talking about a specific past situation:

• Si dejé la leche fuera, se dañó rápido. (If I left the milk out, it spoiled quickly.)

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Why isn’t the subjunctive used after si here?

Because this sentence talks about a realistic, possible condition. Spanish uses the indicative with si for real conditions:

• Si + present indicative → real/general condition

Subjunctive with si appears in unlikely/hypothetical conditions:

• Si dejara/dejase la leche fuera, se dañaría. (If I were to leave the milk out, it would spoil.)
• Si hubiera dejado la leche fuera, se habría dañado. (If I had left it out, it would have spoiled.)

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What does mean exactly, and why is there a ?