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 ...

Prefixes are a group of letters that change the meaning of a word when they are added to the start. The prefix un- usually means 'not', so the new word means the opposite of the original.

They are inconspicuous and usually very short – but they can have a great effect: In the German language, prefixes sometimes succeed in completely changing the meaning of a word. If you read carefully ...