Choose the correct form of the verb in parentheses

Ustedes no_(montar) en biciclets en el parque
montan
montamos
monta
montais

montan

Ustedes no montan en bicicletas en el parque.

To determine the correct form of the verb "montar" (to ride) in the sentence "Ustedes no __ en bicicletas en el parque", we need to consider the subject "ustedes" which refers to the pronoun "you" in plural form (informal).

The correct form of the verb for the pronoun "ustedes" in the present tense is "montan".

So, the correct sentence in Spanish is: "Ustedes no montan en bicicletas en el parque."