Words are made up of roots, bases, stems, derivational endings ... It is found in refer, infer, prefer, differ, prefer, offer. The forms to the left of -fer are prefixes which cannot occur in ...

Root words are words that can grow and transform into new words. Sometimes they can sprout an extra part at the end. This is called a suffix. Different suffixes change words and their meanings.

Prefixes are groups of letters that are added to the start of words to change their meaning. Watch this clip to learn more about prefixes. Remember: 'Root words' are the basic words that are used ...