Final answer:
The correct verb form is 'Escribiste'. Pronouns, articles, and verb forms are essential in Spanish sentences.
Explanation:
'Escribiste' is the correct form of the verb for the sentence '¿Le escribiste una carta a tu abuela?'. This means 'Did you write a letter to your grandmother?'
In the provided information, pronouns, articles, and verb forms are used to convey different actions and relationships.
Understanding verb conjugations is crucial in forming correct sentences in Spanish.
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