In terms of accent I think there are some accents well known and approved by majority people like Oxford Accent and Midwest Accent but still accent is a part of identity so I think people should re
"Communication is hard without grammar but it is impossible without vocabulary". Allocating specific class time to vocabulary: Especially for young learners there are a lot of joyful vocabulary teaching techniques.
When I was teaching to young learners my students love to competition. They really had lots of fun and the production was really good, too. It must be something about age thing.
It is clear that language is a human feature and somehow all human beings know a language. In terms of linguistics the point is answering how human beings knowing language.