By Prefixes, Vocabulary

I think before teaching vocabulary, we need to choose active and passive vocabulary. For passive words, we only realize and don't spend a lot of time to explain them. Students will research themselves by looking up in the dictionary or guessing from the context. Thus, we have to define which word...

Hi folks. I was teaching a lesson on vocabulary and decided to teach prefixes, suffixes and roots (eg Latin and Greek). I am not sure how you differentiate between, for example, a prefix and a root. It seems that "hydro" is a root but "geo" is not. "Bio" maybe a root or a prefix?????? Is it...