Learn Spanish (Latin America): ¡Qué calor! Yo iba a comer el cono, pero se derritió demasiado rápido. - What heat! I was going to eat the cone, but it melted too fast.

The structure iba a + infinitive uses the imperfect tense to express a past intention or plan, especially one that was interrupted or unfulfilled. If you used the preterite (fui a comer), it would mean you went somewhere for the purpose of eating the cone, and strongly implies you actually carried out the action.

Why does 'melted' translate to se derritió with the reflexive pronoun se?

Spanish uses the pronominal form derretirse when something melts on its own, experiencing a change of state (like ice cream or snow). If you used derretir without the se, it would mean that a subject melted an object (for example, 'the sun melted the cone').

Wait, isn't the verb derretir? Why is it spelled with an 'i' in derritió?

You are right that the infinitive is derretir. However, in the preterite tense, many '-ir' verbs undergo a stem change in the third-person forms (he, she, it, and they). The 'e' changes to an 'i', making it se derritió.

Since cono is masculine, would demasiado rápido change to demasiada rápida if we were talking about a feminine noun?