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W/B 15.06.20 - im- and ir- prefixes

Prefixes are groups of letters that can go at the beginning of a word. They usually change the meaning of the root word. The prefixes im- and ir- mean not, like in- and il-. When a root word starts with ‘r’, the prefix used to turn the word into a negative is ir- rather than im-.



  • Look at our word list and put the words in alphabetical order. Remember to look at the third letter, then the fourth and maybe the fifth to help you order the words. Can you explain the meaning of each word? If you are unsure of a meaning use a dictionary (if you have one at home) or check with a grown up.
  • Write each word in a sentence.
  • With a member of your household play Guess the Word - take it in turns to choose one of the focus word cards (see below) and think of four or five clues about the word e.g. a clue could give information about the number of syllables in the word, the meaning, the first/final letter. If the word is guessed correctly than reward a point. How many points can each player get?
  • Complete the Change the Word activity. You need to change the word in brackets in each sentence to a negative word by adding either the im- or the ir- prefix.