Final answer:
The present progressive tense of 'El señor / servir / unas bebidas' in Spanish is 'El señor está sirviendo unas bebidas.'
Step-by-step explanation:
The present progressive tense of 'El señor / servir / unas bebidas' in Spanish is:
'El señor está sirviendo unas bebidas.'
The present progressive tense in Spanish is used to describe an action that is currently happening. It is formed by using the verb 'estar' conjugated in the present tense followed by the gerund form of the main verb.
In this case, 'El señor' is the subject, 'está' is the present tense conjugation of 'estar', and 'sirviendo' is the gerund form of 'servir'.
Learn more about Spanish verb conjugation