生命起源纪录片:When I am after 20<--有语法错误吗？如何修改？

When I am after 20<--有语法错误吗？如何修改？ When I am needed When I am after 17.For the sky,disappeared in the cities……ミ l love you not because of who you are .but because of who i am when i am with you. as after as I am concerned 是什么意思？ l love you not because of who you are ,but because of i am when i am with you.这句话要怎么翻译呀？ When I eat,I live,but when I drink,I die.What am I? I am something that always increases when I share myself with others. What am I? who I am when I am with you ，WHO是修饰谁的？ 请问I am strong when i am on your shoulders是什么意思啊