怎么理解What is true cannot become false 请把里面的语法点讲出来,

题目

怎么理解What is true cannot become false 请把里面的语法点讲出来,

答案

true------connected with facts rather than things that have been invented or guessed(往往倾向于事实并且排除想象和猜测)
real --------connected with sth / sb.that actually exists,but is not not specified or proved （强调的确存在,但没有特指或被证明）
1 it wasn't a ghost,but a real person though i can't tell who it is.
2 just tell me everything true about him,and don't make up.