"His Engpsh is very good" 可以用英语表示为: "He has a good command of Engpsh" 或 "He is proficient in Engpsh" 。
"Command" 这个词的意思是掌握、熟练掌握，而 "proficient" 则表示熟练、精通。
例句:
He has a good command of Engpsh, he can speak fluently and write well.
(他的英语很好，他能说得流利并且写得好)
She is proficient in Engpsh and can communicate effectively in a business setting.
(她的英语熟练，能在商务场合中有效地交流)