Vocabulary

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Prefixes


Objectives:
  • Apply knowledge of root words and prefixes to determine the meaning of unknown words
  • Explain how a prefix changes the meaning of a word.
  • Compose sentences with words that contain prefixes.

PART 1: INSTRUCTION: READING

1. A prefix is a syllable that is added to the beginning of a root word to form a new word. A root word is the base word. For example the word “write” is a base word. We add the prefix “re” to the base word. Base Word New Word
write rewrite
2. Now the new word is “rewrite” which means to "write again". The new word has a different meaning.

3. Look at the word prefix. It is made up from two parts: pre and fix. Pre means before, and fix means attached. Pre is a syllable that is placed before the root which in this case is fix.

4. Prefixes are useful because if we know how to identify them and their meaning, we can learn the meaning of the new word and improve our vocabulary.



EXAMPLES OF NEW WORDS
Prefix
 Meaning
 Word Example
 Word Meaning
re
 do again
 recycle
 to use again
re
 back
 return
 to give back
de
 down
 decline
 to grow smaller
de
 away
 deforestation
 the process of clearning trees
PART 2: FLASHCARDS
1. The link below is link to a set of flashcards with words that include the prefixes
re and de. Go through the flashcards to determine how the prefix changes the
word meaning of the base word.
PREFIX FLASHCARDS

2. To hear the word pronounced, click on the audio icon: EAR.png


3. Practice the words by playing the games: “Scatter” and “Space Race”

4. Take the test. Make sure you view the comments if you missed any words.


PART 3: VIDEO
1. The link below is a link to a National Geographic video on global warming. Listen to the video once. Then relisten (listen again)
to video. Write down at least three words with prefixes.

PART 3: ARTICLE – “Ways to Reduce Air Pollution”

  1. The link below the article, “Ways to Reduce Air Pollution” Read the article once. Then reread the article. Write three words with prefixes from the article. http://www.epa.gov/airquality/peg_caa/reduce.html


PART 4: Write Sentence
  1. You should have eight words with prefixes. Choose five of the words and write complete sentences with each of these words. Post your sentences on the class’s wiki
  2. Choose one of your sentences and add it to the post-it link below.
  3. Check your classmates’ sentences. If you notice mistakes in the sentence, e-mail the classmate and give him/her your idea.
  4. As the final editor, each student will decide if he/she needs to correct his/her sentence. Correct the sentence if you it needs to be corrected.

PART 5: Assessment
1. Answer the questions below. Submit your answers.