这句话有什么语法问题吗?Although Shanghai is not the best city in the wo

这句话有什么语法问题吗?Although Shanghai is not the best city in the world ,it is always the
Although Shanghai is not the best city in the world ,it is always the most important one in my heart.Because Shanghai is the place where I was born,the place where I grown up,the place which let me know what is family ,friends and love.Even if I will study in a different city in the future ,I will never forget you.I love my hometown ,always have always will.