As a Native English-Speaking Teacher (NEST) who didn't learn any English grammar at school, it wasn't until I started training as a teacher and then teaching that I really started to get to grips with the English grammatical - and later lexical - system. In fact, I don't think there's ever been a point where I've felt I understand the whole system. That's one of the great things about being a teacher - you keep learning. When I first started out as a language teacher in the mid-1990s, I...