"我能认出他" 的英文表达是 "I can recognize him."

这句话的来源是英语动词 "recognize," 意思是 "to be able to identify someone or something from having seen or known them before."

下面是一些例句：

I recognize his face, but I can't remember his name. (我认出他的脸，但我记不起他的名字。)
She recognized her old teacher at the supermarket. (她在超市里认出了她以前的老师。)
He recognized the famous actor as soon as he saw him on TV. (他一看电视就认出了那位著名的演员。)