most-challenging-second-foreign-language-acquisition Post author By Mark Biernat Post date 10:30 pm No Comments on most-challenging-second-foreign-language-acquisition By Mark Biernat I live in with family between two worlds, US and Europe where I create tools for language learning. If you found my site you probability share my passion to be a life long learner. Please explore my site and comment. View Archive → Leave a Reply Cancel reply This site uses Akismet to reduce spam. Learn how your comment data is processed.