Writing Mini-Lessons: Suffixes, To Double or Not?

Suffix Rule #1: On one-syllable words that end with a single vowel and a consonant: double the final consonant before adding a suffix that starts with a vowel.

Some suffixes that start with vowels:

-al -ing -ed -able -ible -er -en -ee -est

Try it yourself: add one of the suffixes above to each of the base words below.

Base Word

hug ➞

sad ➞

swim ➞

skip ➞



Suffix Rule #2: On words of more than one syllable that end with a single vowel and a consonant and are accented on the last syllable, double the final consonant before adding a suffix that starts with a vowel.

Try it yourself: add a suffix that starts with a vowel to each of the base words below. Think carefully about which syllable is accented.

Base Word

refér ➞

occúr ➞

omít ➞

contról ➞

regrét ➞

depósit ➞

commít ➞

góssip ➞

forbíd ➞

confér ➞

trável ➞

permít ➞

fínal ➞

begín ➞



EXCEPTION: transferred

More practice: add a suffix that starts with a vowel (your choice of -ing, -ed, or -er) to each of the words below, doubling consonants as appropriate.

big embed
knot read
whip begin
lap admit
grab prefer
hope control
skin reform
step deter
dim worship
trap commit
blur forget
shop blot
confer rope
treat gallop
wrap come
upset jam