Consider the verb defer. There is no verb stem *fer. Fer is a verbal root. It is found in refer, infer, prefer, differ, prefer, offer. The forms to the left of -fer are prefixes which cannot occur in ...

Watch this clip to learn more about prefixes. Remember: 'Root words' are the basic words that are used to form other words. Root words haven't had any prefixes or suffixes added to them yet.

Pull the list down corresponding to the entries for which you need the suffix. Hit Enter when done, and it will add the prefix to every entry in the intended column. We can use two functions to ...