Read pages 4-14 in the book The Magic of Language: Prefixes and Suffixes, which introduces the meaning of, prefixes and gives a multitude of examples.
Write some of the common prefixes and talk about what they mean:
dis- not, opposite (disagree, disagree, distrust)
im- not, without (impossible, improper)
in- not, without (inaction, invisible)
pre- before (prefix, preview)
re- again, back (reappear, review, return)
un- against, not (unequal, undo, unusual, unkind)
de- from, down (declaw, decrease)
ex- out of, away from (exhale, exchange)
Use the above conversation that you have written and ask the children to find the words with prefixes. Underline the base or root word and note how it changes the meaning
(misplace, impossible, nonsense, disappear).