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# 7.23: The Sound [t] and Assimilation

Created by: CK-12

## The Sound [t] and Assimilation

1. Earlier you saw that when the prefix ad- is added to a stem that starts with a <t>, the <d> assimilates: It changes to a <t>, making two <t>'s a$\cancel{d}$ + t + tain = attain.

When the prefix ad- is added to a stem that starts with a <t>, the ____ assimilates and changes to a _____.

2. Here again are the nine words from the last lesson in which [t] is spelled $<\text{tt}>$.

$&\text{cattail} && \text{regretting} && \text{bottom}\\&\text{committed} && \text{outtalk} && \text{attention}\\&\text{submitted} && \text{upsetting} && \text{attend}$

There are two words in the nine that contain the prefix ad- and a stem that starts with a <t>. Find them and analyze them to show the assimilation that gives us the $<\text{tt}>$ spelling, as we have done with attain:

Word = Assimilated Prefix ad- + Stem
attain = a$\cancel{d}$ + t + tain
= +
= +

3. Now sort the nine words into the following three groups:

Among the nine words in Item 2, the word in which the $<\text{tt}>$ is not due to either simple addition, assimilation, or twinning is _____________. We will talk about words like this one in the next lesson.

4. Analyze each of the following words to show where the $<\text{tt}>$ spelling comes from:

Word = Analysis
outtrick =
attracts =
knotty =
quitter =
attempt =
outtake =
rattrap =
regretted =
permitting =
attendance =
fattest =
fattiest =

5. Three reasons for [t] being spelled $<\text{tt}>$ are ______, ______, and ______.

## Subjects:

1 , 2 , 3 , 4 , 5

Feb 23, 2012

Jan 16, 2015