你不会真的觉得我会相信你不认识他吧。You can't really expect me to believe you didn't know him.“我不认识他，是吧？”——“对，你不认识他。”"I don't know him, do I?" — "No, you don't."我不认识这个小伙子。I never knew the lad....

“不认识”的英语可以翻译为：incognizance，incognizant ...