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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, ad\begin{align*}\cancel{d}\end{align*} + t + tempt and ad\begin{align*}\cancel{d}\end{align*}+ p + pear.

In the same way, when the prefix sub- is added to a stem, the <b>\begin{align*}<\mathrm{b}>\end{align*} and [b] often assimilate to become more similar to the stem's first letter and sound. Thus, sub\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>\begin{align*}<\mathrm{b}>\end{align*} and [b] have assimilated, and in some they have not. Analyze each word into its prefix and stem, showing any assimilation:

Word = Prefix + Stem
summon = sub\begin{align*}\cancel{b}\end{align*} + m + mon
success = sub\begin{align*}\cancel{b}\end{align*} + c + cess
supply = sub\begin{align*}\cancel{b}\end{align*} + p + ply
subject = sub + ject
suffer = sub\begin{align*}\cancel{b}\end{align*} + f + fer
support = sub\begin{align*}\cancel{b}\end{align*} + p + port
submarine = sub + marine
sufficient = sub\begin{align*}\cancel{b}\end{align*} + f + ficient
suppose = sub\begin{align*}\cancel{b}\end{align*} + p + pose
substitute = sub + stitute
suburbs = sub + urbs
succeed = sub\begin{align*}\cancel{b}\end{align*} + c + ceed
surrogate = sub\begin{align*}\cancel{b}\end{align*} + r + rogate
suppress = sub\begin{align*}\cancel{b}\end{align*} + p + press
suggest = sub\begin{align*}\cancel{b}\end{align*} + g + gest
submitting = sub + mitting

2. Sort the words into these two groups:

Words in which the [b] and the
assimilated: did not assimilate:
summon subject
success submarine
supply substitute
suffer suburbs
support submitting
sufficient
suppose
succeed
surrogate
suppress
suggest

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

Words in which the
<f> <c> <p>\begin{align*}<\mathrm{p}>\end{align*}
suffer success supply
sufficient succeed support
suppose
suppress
Words in which the
<g> <m> <r>
suggest summon surrogate

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

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

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