Conditional warnings (como)

Warnings and threats with "como"

You already know como as "like," "as," or "how." In conversational Spanish, it is also frequently used to mean "if" when issuing a warning or mild threat.

When como is placed at the beginning of a sentence to introduce a negative consequence, it triggers the subjunctive.

If you don't eat your vegetables, I will take away the tablet.
Como no comas la verdura, te quito la tableta.

This structure is very common when setting boundaries or dealing with bad behavior:

If you disobey me again, I will take away your allowance.
Como me desobedezcas otra vez, te quitaré la paga.
If you have another tantrum, we are leaving. I am warning you.
Como tengas otra rabieta, nos vamos. Te aviso.

"Como" vs. "Si"

For a neutral "if/then" statement about the present or future, use si + indicative.

If you scream so much, you will go mute.
Si chillas tanto, te quedarás mudo.

To emphasize the warning, swap si for como and change the verb to the present subjunctive. The meaning remains "if," but the tone becomes stern.

If you scream, I will ignore you.
Como chilles, te ignoraré.
If you don't shut up, I am going to punish you until you learn.
Como no te calles, te voy a castigar hasta que aprendas.

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