Final answer:
The sentence '¿Conocen Uds. a la niña con el abrigo rojo?' is grammatically correct. The subject is 'Uds.' meaning 'you all' and the sentence asks if they know the girl with the red coat.
Step-by-step explanation:
The sentence ¿Conocen Uds. a la niña con el abrigo rojo? is grammatically correct. The subject of the sentence is 'Uds.', which is the abbreviation for 'ustedes' meaning 'you all'. The verb 'conocen' is conjugated in the third person plural form to match the subject. The rest of the sentence asks if they know the girl with the red coat.
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