The present subjunctive form of the verb comer is coman.
Subjunctive refers to those words which denotes the wish or mood through which verb is used. for example: I wish it were Sunday. In this sentence were is subjunctive used to describe the mood or wish.
In this case present subjunctive word for comer is Coman. and ustedes is the Spanish word which is third person plural. Here coman means to eat.
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