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7.1: A Final Point About Twinning in Longer Words

Difficulty Level: At Grade Created by: CK-12

1. You twin the final consonant of a free stem that has two vowel sounds only when four conditions are met:

i. The stem ends with a single consonant letter that is not _________

ii. The stem ends with the pattern _________ 

iii. The suffix starts with a _________

iv. The stem has strong stress on the _________ vowel sound.

The strong stress must be on the final vowel of the stem before you add the suffix, and it must stay on that vowel when the suffix is added. If the stress is not on the final vowel of the stem both before and after the suffix is added, we do not twin the final consonant.

Sometimes the stress is where it should be after the suffix has been added, but it was not there before the suffix was added. For instance, symbolic has stress on the <o>. But in the stem symbol the stress is on the <y>. So the final <l> is not twinned in symbolic.

Sometimes the stress is where it should be at first, but when the suffix is added, the stress moves. For instance, prefer has stress on the final vowel, but if we add the suffix -ence, we make the word preference, which has stress on the first vowel. So the final <r> is not twinned in preference.

Notice, though, that if we add a suffix like -ed to the stem prefer, we make preferred, in which the stress stays on the final vowel of the stem, so the final <r> is twinned.

2. In the table below when you are given a word, analyze it into its free stem plus suffix. Show any twinning that takes place. When you are given the analysis, write the word in the Word column.

Word Analysis: Free Stem + Suffix
labor + ious
refer + ee
equip + ment
angel + ic
outtalk + ed
allow + ance

3. In fifteen of the words above, twinning did not take place when the suffix was added to the stem. In each case it was because one of the four conditions was not met. Write the fifteen words into the Word column in the table below. Then put a check in the column that gives the reason twinning did not take place in that word:

Word The stem ends with the wrong letter The stem doesn't end CVC The stress is in the wrong place The suffix starts with the wrong letter
preference \begin{align*}\checkmark\end{align*}

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Date Created:
Oct 11, 2015
Last Modified:
Apr 22, 2016
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