Would he have seen you的语法结构

原文是：Would he have seen you if you hadn't waved to him?
这句话的意思是：如果你没有朝他挥手，他能看见你吗？
请问：Would he have seen you 是什么语法结构？疑问句？倒装句？虚拟语气？

If Mr Smith _______ here, he would have helped you he would have none of it.怎么翻译啊？ He kept his head otherwise the accident would have happen Would he have seen you的语法结构 3.Jack __ have arrived yet,otherwise he would have telephoned me. if he knew this , it would have had to be by accident句子成分 i would have told him more but much to my surprise he kiss me. 什么意思？ he hesitated for a moment before kicking the ball,otherwise he would have scored a goal什么意思? He told me how he had given me shelter and protection without which I would have died of hunger. The measure of a man's real character is what he would do if he knew he would never be found out!