Adding Suffixes: Doubling Consonants & Dropping Silent E: Fifth Grade English Student Guide

Adding suffixes like -ed, -ing, -er, and -est requires mastering foundational spelling formulas: the 1-1-1 doubling rule and the silent e dropping convention.

The 1-1-1 Doubling Rule

When adding a suffix that begins with a vowel (such as -ed, -ing, -er, -est, or -able) to a base word, you must determine whether to double the final consonant. Apply the 1-1-1 Doubling Rule: If a word has ONE syllable, contains ONE vowel, and ends in ONE consonant, DOUBLE the final consonant before adding a vowel suffix.

+--------------------------------------------------------------+
|                     THE 1-1-1 DOUBLING TEST                  |
|                                                              |
|   Word: HOP                                                  |
|   * One syllable?        [YES]                               |
|   * One vowel? (o)       [YES]                               |
|   * Ends in one consonant? (p) [YES]                         |
|                                                              |
|   RESULT: Double the 'p'!                                    |
|   hop + -ed  ====> hopped                                    |
|   hop + -ing ====> hopping                                   |
|                                                              |
|   Contrast with HOPE (Has silent e; NOT 1-1-1):              |
|   hope + -ed ====> hoped (Drop e, add ed)                    |
+--------------------------------------------------------------+

Why Doubling Matters: Protecting Vowel Sounds

Doubling the final consonant protects the short vowel sound. In English, a vowel in a closed syllable remains short: "hopping" has a short /ah/ sound because the doubled 'p' closes the first syllable (hop-ping). If you fail to double the consonant and write "hoping," the first syllable becomes open (ho-ping), turning the vowel into a long /oh/ sound!

The Silent E Dropping Rule

When a base word ends in a silent -e, look at the first letter of the suffix you are adding. If the suffix begins with a VOWEL (-ed, -ing, -able, -ous), DROP the silent -e. If the suffix begins with a CONSONANT (-ful, -ment, -less, -ly), KEEP the silent -e.

+--------------------------------------------------------------+
|                 THE SILENT E SUFFIX FORMULA                  |
+------------------------------+-------------------------------+
| SUFFIX STARTS WITH VOWEL     | SUFFIX STARTS WITH CONSONANT  |
| (DROP THE SILENT E)          | (KEEP THE SILENT E)           |
+------------------------------+-------------------------------+
| drive  + -ing ===> driving   | care   + -ful ===> careful    |
| amaze  + -ed  ===> amazed    | excite + -ment===> excitement |
| navigate+-able===> navigable | hope   + -less===> hopeless   |
+------------------------------+-------------------------------+

Soft C and Soft G Exceptions

When a word ends in -ce or -ge (such as notice or courage), keep the silent -e before suffixes starting with 'a' or 'o' (-able, -ous) to preserve the soft sound: "noticeable" (not noticable) and "courageous" (not couragous). Without the 'e', the 'c' and 'g' would harden into /k/ and /g/.

Exercises and Solutions

Exercise 1: Applying Doubling and Dropping Rules. Combine the base word and suffix correctly based on the rules: Word A: "stop" + "-ed." Word B: "shine" + "-ing." Word C: "peace" + "-ful." Word D: "skate" + "-er."

Solution 1: Word A: "stopped" (stop is a 1-1-1 word, so double the final 'p'). Word B: "shining" (shine ends in silent e; -ing begins with a vowel, so drop the 'e'). Word C: "peaceful" (-ful begins with a consonant, so keep the silent 'e'). Word D: "skater" (skate ends in silent e; -er begins with a vowel, so drop the 'e').

Exercise 2: Analyzing Vowel Sound Preservation. Explain why failing to double the consonant 'n' in the word "planning" alters the word into "planing," and explain the resulting change in pronunciation.

Solution 2: In "planning," doubling the consonant 'n' creates two syllables (plan-ning) where the first syllable remains closed, preserving the short /a/ vowel sound (/ah/). If the 'n' is not doubled, the spelling becomes "planing," which splits the syllables as (pla-ning); this leaves the first syllable open, forcing the vowel 'a' to become long (/ay/), turning the word into "planing" (smoothing wood with a carpentry plane).