Conlanging

The book version of Zompast's language construction kit is a great combination of training and conlanging. The problem is a refresher on English grammar or even advanced English grammar is not going to help you with conlanging because it's only going to talk about English grammar. We were just learning out of language from a small number of people in Tanzania. So, yeah, I would definitely... I would definitely suggest you go into more general linguistic stuff.