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Grade 3 English · Unit 4: Spelling

Suffix Rules

Apply doubling, drop-the-e and y-to-i rules when adding suffixes.

Three rules help you add suffixes. Rule 1: in short words with a short vowel and one final consonant, double the consonant before a vowel suffix: stop, stopping, stopped.

Rule 2: drop a silent e before a vowel suffix: write, writing; share, shared. Keep the e before a consonant suffix: hope, hopeful.

Rule 3: change a final consonant + y to i before most suffixes: carry, carried; happy, happiness. Keep the y before -ing: carrying.

Worked example

Add -ed to “copy” and -ing to “copy”.

  1. Copy ends in consonant + y.
  2. Before -ed, change y to i: copied. Before -ing, keep the y: copying.

Answer:copied, copying

Key words

vowel suffix
a suffix that starts with a vowel, like -ing
silent e
an e at the end that is not sounded
double
write the consonant twice
Practise this

New questions every time.

Common Core-referenced: L.3.2e, L.3.2f