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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\cancel{d} + t + tempt and a\cancel{d}+ p + pear.

In the same way, when the prefix sub- is added to a stem, the <\mathrm{b}> and [b] often assimilate to become more similar to the stem's first letter and sound. Thus, su\cancel{b} + 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 <\mathrm{b}> 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 = su\cancel{b} + m + mon
success = su\cancel{b} + c + cess
supply = su\cancel{b} + p + ply
subject = sub + ject
suffer = su\cancel{b} + f + fer
support = su\cancel{b} + p + port
submarine = sub + marine
sufficient = su\cancel{b} + f + ficient
suppose = su\cancel{b} + p + pose
substitute = sub + stitute
suburbs = sub + urbs
succeed = su\cancel{b} + c + ceed
surrogate = su\cancel{b} + r + rogate
suppress = su\cancel{b} + p + press
suggest = su\cancel{b} + 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

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

Words in which the
<f> <c> <\mathrm{p}>
suffer success supply
sufficient succeed support
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-

& \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

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Date Created:

Feb 23, 2012

Last Modified:

Jan 26, 2015
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