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# 9.5: The Prefix Com- and Partial Assimilation

Difficulty Level: At Grade Created by: CK-12

## The Prefix Com- and Partial Assimilation

1. In an earlier lesson we saw that sometimes the <n> in the prefix in- changes to an <m> even though the first letter of the stem is not an <m>. An example is the word impression: in\begin{align*}\cancel{n}\end{align*} + m + pression. This is called partial assimilation. The prefix com- does a similar thing:

In most of the words with com- the <m> changes to an <n>, even when the stem does not start with an <n>. This partial assimilation of <m> to <n> still makes the word easier to say.

2. The first three letters in each of the following words are some form of com-. Sometimes it has assimilated partially by changing <m> to <n>, and sometimes it has not. Analyze each word to show what happened when com- was added to the stem in that word:

Words = Prefix + Stem
consist = com\begin{align*}\cancel{m}\end{align*} + n + sist
conduct =
conversation =
commission =
compare =
confidence =
composition =
consent =
confession =
content =
commerce =
congress =
conceal =
confront =
continue =

3. Now sort the fifteen words into these two groups:

Word Change. Make the changes called for by the instructions and fill in the blank in the final sentence:

Instructions Words
1. Write the word college. 1.
2. Change the fourth consonant in the word to the second consonant in the alphabet. Then change the second <e> in the word to the letter that comes between <s>\begin{align*}<\text{s}>\end{align*} and <u>\begin{align*}<\text{u}>\end{align*} in the alphabet. 2.
3. Change the third and fourth letters in the word to the letters that come two places after them in the alphabet. 3.
4. Change the third and fourth letters in the word to the letters that come four places after them in the alphabet. 4.
5. Change the second consonant in the word to the letter that comes between <m> and <o> in the alphabet. Then change the third consonant in the word to the third consonant in the alphabet. And then change the <e> to <u>\begin{align*}<\text{u}>\end{align*}. 5.
6. Change the base of the word to <sist>. 6.
7. Change the second vowel in the word to the second vowel in the alphabet. Change the fourth consonant in the word to <n>. 7.

If you followed the instructions just right, your solution is __________.

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