For anything,only the perseverance can bring success.问你一个语法方面的问题：when I read a book, I feel happy可不可以省略主语写成when reading a book ,I feel happy时间状语从句，还是写完整比较好。但是会有有个字母" I "出现，会不会不地道呢？there is no unadulterated language, only the words local people say so every day. So, making what you want to express clear would be the priority.