¿qué se quebraron los niños?
los niños se quebraron los dientes.
los niños se quebró los dientes.
los niños se quebramos los dientes.
los niños se quebraba los dientes.

Los niños se quebraron los dientes.

Explanation:

This tense is used to talk about actions that took place in the past and has no relation to the present.  

The past perfect simple or past tense is formed based on the root of the verb (infinitive minus -ar, -er, or -ir) and adding the following disinherities:  

* Verbs of the first conjugation (ending in -ar): -é, -aste, -ó, -amos, asteis, -aron  * Verbs of the second and third conjugation (ending in -er or -ir): -í, -iste, -ió, -imos, -isteis, -ieron .

In Pretérito perfecto simple tense the conjugation of "quebrar" is:

Yo quebré

Tu quebraste

él / ella / usted quebró

Nosotros quebramos

Vosotros quebrasteis

Ellos quebraron

A) Los niños se quebraron los dientes.

Explanation:

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