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6.22: Lesson Forty-six

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More About Twinning in Longer Words

1. Here are the two sets of free stems that you found in the last lesson. Mark the last three letters of each stem, V for vowels, ‘c’ for consonants, as we have done with forbid

Free stems in which . . .
twinning occurred: twinning did not occur:

forbid

cvc

regret

cvc

assist

vcc

disgust

vcc

commit

cvc

refer

cvc

revolt

vcc

retain

vcc

submit

cvc

untap

cvc

conceal

vcc

retreat

vcc

Sort the twelve stems into this matrix:

Free stems that . . .
end in CVC do not end in CVC
Stems in which twinning occurred

forbid

commit

submit

regret

refer

untap

Stems in which twinning did not occur

assist

revolt

conceal

disgust

retain

retreat

2. How many vowel sounds were there in each of the twelve stems? Two Did the stems in which twinning occurred end in CVC? Yes

3. You twin the final consonant of a free stem that has two vowel sounds only when the free stem ends CVC

4. Each of the words below contains a free stem and a suffix. Sometimes the final consonant of the stem was twinned when the suffix was added; sometimes it was not. Each of the free stems contains two vowel sounds. Analyze each word into its free stem and suffix, showing any twinning that has taken place:

Word = Free Stem + Suffix
submitter = submit + t + er
equipment = equip + ment
forbids = forbid + s
equipped = equip + p + ed
zigzagged = zigzag + g + ed
commits = commit + s

5. Sort the six words into these two groups. Notice that we are working here with the whole original word from the left column, not just with the free stems:

Words in which . . .
twinning occurred twinning did not occur
submitter equipment
equipped forbids
zigzagged commits

6. In the words in which twinning occurred, did the suffix start with a vowel or did it start with a consonant? A vowel

7. You twin the final consonant of a word with two vowel sounds when the word ends CVC and you add a suffix that starts with a vowel

Teaching Notes. The main point of this lesson is for the students to see that the same conditions prevail for twinning in free stems with two vowel sounds as prevail for free stems with only one vowel sound. So far the rule has not really been changed.

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1 , 2 , 3 , 4 , 5

Date Created:

Feb 23, 2012

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Apr 29, 2014
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