A prefix is added to the beginning of a word to change its meaning, often making it the opposite or antonym. The document provides examples of negative prefixes like "un", "dis", "mis", "im", and "il" that can be added to word roots to form antonyms. Readers are instructed to use dictionaries and thesauruses to add these negative prefixes to word roots on their whiteboards to generate more antonym examples.

1. Negative Prefixes
A prefix is added to the beginning of a word, or to a
word root to change its meaning. For example adding un to
pleasant becomes unpleasant. It makes the original word
an antonym (its opposite)
Try these: Move the
un to the root word
and see what antonym
you get
Un
dress
decided
cooked
acceptable
pleasant
did

2. Choose negative prefixes from the box to make each of
these words into antonyms.
word roots
justice
polite
approve
behave
possible
sufficient
literate
colour
trust
honest
In dis mis im il
Can you think of any more
examples of antonyms
containing these negative
prefixes? Does it change its
spelling in each case?
Can you think of any more
examples of antonyms
containing these negative
prefixes? Does it change its
spelling in each case?

3. Use a dictionary and a thesaurus to help. On your
whiteboards write these word roots to make antonyms.
Workin pairs.
Word
experience
logical
mature
regular
possible
complete
legal
reversible
Antonym using negative
prefix
Show me your
Whiteboards.
How did you get on?
What did you learn?