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# 13.18: Some Prefixes That Make <cc>

Difficulty Level: At Grade Created by: CK-12

## Some Prefixes That Make <cc>

1. What always comes before <kle>, a vowel or a consonant? ________. What always comes before <ckle>, a long vowel, a short vowel, or a consonant? ________. What usually comes in front of the <cle>, a vowel or a consonant? ________

2. When they are added to stems that start with <c>, the three prefixes ad-, sub-, and ob- assimilate to ac-, suc-, and oc-, making a <cc> toward the front of the word. Sometimes the <cc> spells the sound [k]; sometimes it spells [ks].

All of the following words contain one of these prefixes. Analyze each word into prefix and stem and show where the two <c>s come from:

Word Prefix + Stem
accelerate ad\begin{align*}\cancel{d}\end{align*} + c + celerate
according
account
occasionally
successful
occurrence
occupy
accident
accurate
access
occupation
accompany
accommodate
succinctly
accuse
accumulate

3. Sort the words into these two groups:

4. Look carefully at the letter that comes right after the <cc> in each of the words. Then sort the words into this matrix:

5. Be ready to discuss this question: Why do the words sort out the way they do in the matrix in Item 4?

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