# 13.3: Review of Twinning

Difficulty Level: At Grade Created by: CK-12

## Review of Twinning

1. The Rule of Simple Addition says that elements combine without change unless you know some special reason for making a change. One special reason is twinning:

Twinning Rule. You twin the final consonant of a free stem that has one vowel sound in it when you add a suffix that starts with a vowel and the stem ends in the pattern CVC. You twin the final consonant of a free stem that has more than one vowel sound in it when you add a suffix that starts with a vowel and the stem ends CVC only when there is stress on the last vowel of the stem before and after the suffix is added:

\begin{align*}twin + ing & = twin + n + ing = twinning \\ occur + ence & = occur + r + ence = occurrence\end{align*}

2. Analyze each of the following words into free stem plus suffix. Show any cases of twinning in your analysis. Then answer the questions in the columns on the right. Assume that in any stems that have only one vowel sound, that vowel is stressed:

Word = Free Stem + Suffix Does the suffix start with a vowel? Does the stem end in the pattern CVC? Is there stress on the last vowel in the stem before you add the suffix? Does the stress stay on the last vowel of the stem after you add the suffix?
twinning = twin + n + ing Yes Yes Yes Yes
occurrence =
kidnapper =
lucky =
committed =
symbolic =
commitment =
displayed =
limiting =
exceeding =
excelled =
cooking =
repellant =
compelling =
logical =
informer =
submits =
exacting =
recruiter =

3. Look over the results of your work. You should find that for each word in which twinning occurred you have “Yes” in all four columns on the right. You should also find that for each word in which twinning did not occur you have at least one “No” in the columns on the right. If things did not work out that way, check over your work. If you get stuck, don't be afraid to ask for some help.

Twinning Rule. You twin the final consonant of a free stem that has one vowel sound in it when you add a ________ that starts with a ________ and the stem ends in the pattern ________. You twin the final consonant of a free stem that has more than one ________ in it when you add a ________ that starts with a ________ and the stem ends in the pattern ________ only when there is stress on the last ________ of the stem before and after the suffix is added.

4. Combine the following free stems and suffixes. Show any cases of twinning:

Free stem + Suffix = Word
commit + t + ee = committee
complex + ity =
remark + able =
logic + ian =
symbol + ism =
occur + ence =
refer + ence =
recruit + ing =
repel + ing =
overlook + ed =
republic + an =
reveal + ing =
compel + ing =
resubmit + ed =
kidnap + ing =

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