如果你想说你的同事在开会时讲英语，你可以这样说：
"My colleague speaks Engpsh during meetings."
"My colleague conducts meetings in Engpsh."
"My colleague uses Engpsh as the language of communication in meetings."
你也可以这样说：
"My colleague is fluent in Engpsh and prefers to speak it during meetings."
"Engpsh is my colleague's preferred language for meetings."
希望这些给你帮助。