Dear Vincent All of your sentences are good The word "serve" can be followed by the person who is served; or by the food or drink that is served; or with a preposition - and many combinations... He served us very good sandwiches He once served the King of France with excellent food He served a good sandwich to my friend He served at Benoni's for six months and then got a better job serving at Frederick's Hope this helps, Dave
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Anonymousthen got a better job serving at Frederick'sI think the answer is here Vincent. "He serves at Frederick's (the restaurant)".