Future Perfect Continuous in English

It has always been easy for me to learn languages, but at the same time I wasn’t lucky with teachers at school, so there is no base as such. Now I’m in the process of learning English with the help of a teacher on Promova, and also in my free time I read various articles like Future Perfect Continuous in English. Such grammar-related topics have always been difficult for me, and this information is understandable and structured.