The correct form of the verb 'ir' in a present subjunctive sentence is 'vayan'.
Correct Answer: No dudo de que Uds. vayan a ir a clase mañana.
Explanation: In this sentence, 'vayan' is the correct form of the verb 'ir' in the present subjunctive tense. The subjunctive is used after expressions of doubt, uncertainty, or desire.
Example: No dudo de que ellos vayan a la fiesta esta noche. (I doubt that they will go to the party tonight.)
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