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A prerequisite knowledge graph of 1590 learning concepts across 8subjects. Track what you've mastered and see exactly what you're ready to learn next — the topics whose prerequisites you've already met. Built on the Marble Open Skill Taxonomy.

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Suffixes

English · Spelling & Word Study · procedural

Apply suffix spelling rules that require changes to the root word: dropping final -e before vowel suffixes, changing -y to -i, doubling final consonants in short-vowel words; use suffixes -ment, -ness, -ful, -less, -ly

What mastery looks like

  • Spell 'hoping' (drop e), 'cried' (y to i), 'running' (double consonant) applying the correct rule
  • Add -ful, -less, -ness, -ly correctly: 'careful', 'hopeless', 'sadness', 'slowly'
  • Identify which suffix rule to apply to a given root word and explain why

Check your understanding

When Suffixes adds an ending like "-ing" or "-ed" to a word, do they know when to drop a silent "e," double the last letter, or change a "y" to an "i" — for example, "running," "baked," or "happily"?