"an excellent command of" is a grammatically correct phrase and can be used in written English.
It is used to describe a high level of proficiency or understanding in a particular subject or skill. Example: She has an excellent command of the English language, and is able to communicate fluently and effectively in both verbal and written forms.
Our waitress at that meal had an excellent command of English, but we had trouble communicating.
"She has an excellent command of pension law and is highly regarded among her peers," he said.
Most Swedes have an excellent command of English and, when on top form (which normally requires a few alcoholic drinks), can be very approachable and talkative.
She is knowledgeable, with an excellent command of English and very reasonable daily rates, about $15, regardless of the number of visitors she is guiding.
With an excellent command of English, he became a spokesperson for the dissidents and refuseniks in contacting Western correspondents to publicize their cause.
I love Lee Lorenz's cave people, stocky energetic folk, who, like most cavepeople appearing in The New Yorker, have an excellent command of the English language.
He had come to the Yankees with a reputation as a strikeout king in the top Japanese league, a hard thrower with excellent command of four pitches, including a fastball that had been clocked at 98 miles per hour.
Next, this process was reversed by a native English speaker with excellent command of Chinese.
With excellent command of his fastball, and a split-finger fastball that made the Rockies hitters flail, Pelfrey never allowed Colorado to combine more than one hit in an inning.
Her excellent command of English (she once lived in Cambridge) makes conversation easy and entertaining.
Score: 4/5 Why you should listen: Malian musician Bassekou Kouyaté adorns this album with added electric guitar solos, brass and keyboards – sometimes pulling attention away from his excellent command of the ngoni (west African lute).
