Mi amiga sonrió en cuanto oyó el primer aplauso.

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Breakdown of Mi amiga sonrió en cuanto oyó el primer aplauso.

• la amiga: the friend
• ella: she
• en cuanto: as soon as

Questions & Answers about Mi amiga sonrió en cuanto oyó el primer aplauso.

Why is it sonrió and not sonreó?

Because the verb is sonreír and its preterite form is irregular in spelling and stress.

For él/ella/usted, the preterite is sonrió = he/she smiled.

A quick pattern:

• yo sonreí
• tú sonreíste
• él/ella sonrió
• nosotros sonreímos
• vosotros sonreísteis
• ellos sonrieron

Notice that verbs like sonreír and oír often change slightly in the preterite to keep natural pronunciation:

• sonrió
• oyó

So sonreó is not a correct form.

Why is oyó used here instead of escuchó?

Oír means to hear, while escuchar means to listen.

In this sentence, the idea is that she reacted when she heard the first clap, not necessarily that she was actively listening for it. So oyó is the most natural choice.

• oír = to hear
• escuchar = to listen

You could sometimes say escuchó in a similar context, but it would suggest a bit more active attention.

What does en cuanto mean here?