what would you do if you came face-to-face with an alien?

题目

what would you do if you came face-to-face with an alien?
我是说该怎么回答，不是翻译

答案

假如你与一个外星人面对面(时),你会做什么.
what(宾语) would(情态动词) you(主语) do(谓语) if you came face-to-face with an alien(条件状语从句)?
希望能够帮到您~