Usage Note
Reír is a stem-changing verb (e→i in stressed syllables): río, ríes, ríe, reímos, reís, ríen. The reflexive reírse ('to laugh' or 'to laugh at') is equally common and adds a slightly more spontaneous or uncontrolled nuance. Reírse de alguien means 'to laugh at/mock someone', so be careful of context.
Examples
"Todos se pusieron a reír al ver su disfraz."
Natural Translation
Everyone burst out laughing when they saw his costume.
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