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# 7.23: The Sound [t] and Assimilation

Difficulty Level: At Grade 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 ad\begin{align*}\cancel{d}\end{align*} + 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 <tt>\begin{align*}<\text{tt}>\end{align*}.

cattailcommittedsubmittedregrettingouttalkupsettingbottomattentionattend\begin{align*}&\text{cattail} && \text{regretting} && \text{bottom}\\ &\text{committed} && \text{outtalk} && \text{attention}\\ &\text{submitted} && \text{upsetting} && \text{attend}\end{align*}

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 <tt>\begin{align*}<\text{tt}>\end{align*} spelling, as we have done with attain:

Word = Assimilated Prefix ad- + Stem
attain = ad\begin{align*}\cancel{d}\end{align*} + 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 <tt>\begin{align*}<\text{tt}>\end{align*} 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 <tt>\begin{align*}<\text{tt}>\end{align*} spelling comes from:

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

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

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