in the movie after earth will smith character says为什么不是said

要结合上下文的。

　One of the biggest dream killers6 is fear. There are so many people who could have achieved amazing things if only they weren’t afraid. Just think about all the things you’ve wanted to do, but allowed fear to convince7 you that you weren’t capable8, or good enough. In the movie After Earth, Will Smith’s character says, ““Fear is not real. It is a product of thoughts you create. Do not misunderstand me. Danger is very real. But fear is a choice.” Choose not to let fear stop you from achieving your dreams.

恐惧是梦想最可怕的杀手。要是能够克服恐惧，很多人能够成就大事。想想那些你一直想做，但被不具备能力、或者不够好的担心慑服而放弃的事情。在电影《重返地球》中，威尔·史密斯饰演的角色说：“恐惧并不真实存在，仅是思想的产物。别误会。危险真实存在，但是恐惧是一种选择。”选择不要让恐惧成为你实现梦想的障碍。

全文都是一般现在时，用过去时态不对的。