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7.23: The Sound [t] and Assimilation

Difficulty Level: At Grade Created by: CK-12
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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 + 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>.


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> spelling, as we have done with attain:

Word = Assimilated Prefix ad- + Stem
attain = ad + 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> 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> 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> are ______, ______, and ______.

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Date Created:
Feb 23, 2012
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Jan 16, 2015
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