A prefix is a letter or group of letters added to the beginning of a word.

Knowing what a prefix means can help us to understand new words.

There are many different prefixes that change a word into its antonym (opposite).

lucky / unlucky

appear / disappear

visible / invisible

possible / impossible

legal / illegal

In this activity, you can practise choosing the correct prefix to create antonyms.

You may find a dictionary helpful if you are not sure which one is correct.