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# 8.10: The Prefix Sub-

Difficulty Level: At Grade Created by: CK-12

## The Prefix Sub-

1. You have seen that when the prefix ad- is added to a stem, the <d> and [d] often assimilate and become more similar to the stem's first letter and sound, as in attempt and appear: a\begin{align*}\cancel{d}\end{align*} + t + tempt and a\begin{align*}\cancel{d}\end{align*} + p + pear

In the same way, when the prefix sub- is added to a stem, the \begin{align*}<\text{b}>\end{align*} and [b] often assimilate to become more similar to the stem's first letter and sound. Thus, su\begin{align*}\cancel{b}\end{align*} + m + mon = summon

2. In each of the words below, the first letters are some form of the prefix sub-. In some of them the ‘b’ and [b] have asimilated, and in some they have not. Analyze each word into its prefix and stem, showing any assimilation:

Word = Prefix + Stem
summon = su\begin{align*}\cancel{b}\end{align*}+ m + mon
success = +
supply = +
subject = +
suffer = +
support = +
submarine = +
sufficient = +
suppose = +
substitute = +
suburbs = +
succeed = +
surrogate = +
suppress = +
suggest = +
submitting = +

2. Sort the words into these two groups:

3. Now sort the words in which the \begin{align*}<\text{b}>\end{align*} and [b] assimilated into these groups:

Word Find. This Find contains twenty words that start with some form of the prefix sub-:

\begin{align*}&\text{submit} && \text{success} && \text{submarine} && \text{succinct}\\ &\text{sufficient} && \text{subtract} && \text{suppose} && \text{surrogate}\\ &\text{subscribe} && \text{suffocate} && \text{support} && \text{suffer}\\ &\text{substitute} && \text{subject} && \text{supply} && \text{suggest}\\ &\text{succeed} && \text{subdue} && \text{succumb} && \text{summon}\end{align*}

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