# 9.2: Review of Twinning and Silent Final < e > Deletion

Difficulty Level: At Grade Created by: CK-12

## Review of Twinning and Silent Final <e> Deletion

1. Twinning Rule. You twin the final consonant of a stem that has one vowel sound whenever you add a suffix that starts with a vowel and the stem ends CVC. You twin the final consonant of a word that has two or more vowel sounds whenever you add a suffix that starts with a vowel and the stem ends CVC and the stem has strong stress on the final vowel before and after you add the suffix.

2. Combine the following stems with their suffixes. Some combine by simple addition and some with twinning. Show any cases of twinning. Be ready to explain why twinning does or does not occur in each case:

Stem + Suffix = Word
compel + l + ing = compelling
debt + or = debtor
slam + m + ed = slammed
god + d + ess = goddess
cruel + est = cruelest
god + ly = godly
rumor + ed = rumored
knit + t + ing = knitting
permit + s = permits
collect + ed = collected
build + ing = building
exhibit + ed = exhibited
twin + n + ing = twinning
foreign + er = foreigner
develop + ing = developing
boot + ed = booted
blossom + ed = blossomed
chew + y = chewy
ruin + ed = ruined

3. Silent Final <e> Deletion Rule. You delete a final <e> that marks a soft <c> or soft <g> when you add a suffix that begins with the letters <e>, <i>\begin{align*}<\mathrm{i}>\end{align*}, or <y>. You delete all other silent final <e>'s whenever you add a suffix that starts with any vowel.

4. Combine the following stems and suffixes. Some combine through simple addition and some with final <e> deletion. Show any final <e>’s that are deleted as we have done with the first one:

Stem + Suffix = Word
los\begin{align*}\cancel{e}\end{align*} + er = loser
bruis\begin{align*}\cancel{e}\end{align*}+es = bruises
collaps\begin{align*}\cancel{e}\end{align*} + ing = collapsing
influenc\begin{align*}\cancel{e}\end{align*} + ed = influenced
juic\begin{align*}\cancel{e}\end{align*} + y = juicy
acknowledg\begin{align*}\cancel{e}\end{align*} + ing = acknowledging
acknowledge + able = acknowledgeable
routine + ly = routinely
cruis\begin{align*}\cancel{e}\end{align*} + ing = cruising
loose + ness = looseness
costum\begin{align*}\cancel{e}\end{align*} + er = costumer
continu\begin{align*}\cancel{e}\end{align*} + ous = continuous
nonsens\begin{align*}\cancel{e}\end{align*} + ic + al = nonsensical
cloth\begin{align*}\cancel{e}\end{align*} + ing = clothing
absolute + ly = absolutely
commerc\begin{align*}\cancel{e}\end{align*} + ial = commercial
balance + able = balanceable
nuisanc\begin{align*}\cancel{e}\end{align*} + es = nuisances
collid\begin{align*}\cancel{e}\end{align*}+ing =colliding
loos\begin{align*}\cancel{e}\end{align*} + en = loosen
choos\begin{align*}\cancel{e}\end{align*} + y = choosy
overdos\begin{align*}\cancel{e}\end{align*} + ed = overdosed
accommodat\begin{align*}\cancel{e}\end{align*} + ion = accommodation

Teaching Notes.

Item 1. The Twinning Rule is developed inductively in the following lessons: Book 1, Lessons 34-37; Book 3, Lessons 45-47.

Item 2. Twinning does not occur in the following words for the following reasons: Stem does not end CVC: debtor, cruelest, collected, building, foreigner, booted, chewy, ruined. Final vowel of stem is not stressed: cruelest, rumored, exhibited, foreigner, developing, blossomed, ruined. Suffix does not start with a vowel: godly, permits.

Item 3. The Final <e> Deletion Rule is developed inductively in Book 2, Lessons 20-21, Book 3, Lessons 32, 35, 39, 41; and Book 4, Lesson 19.

Item 4. The final <e> is not deleted in routinely, looseness, or absolutely because the suffix does not start with a vowel. It is not deleted in acknowledgeable or balanceable because the suffix does not start with <e>, \begin{align*}<\mathrm{i}> \end{align*}, or <y>, so the <e> is needed to keep the <g> and <c> soft.

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Date Created:
Feb 23, 2012
Jul 07, 2015
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CK.ENG.ENG.TE.1.Basic-Speller.9.2