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Spelling Rule Lab: Plurals, Endings, and Past Tense

Choose a spelling change to inspect the rule, the decision check, worked examples, and an important limit or exception.

A useful spelling rule states the trigger, the change, and the boundary. A slogan without its boundary teaches mistakes.

Test one spelling decision

Inspect the condition before looking at the result.

Use the rule as a decision, not a chant

  1. Inspect the base.Find the final letters, vowel pattern, and number of syllables.
  2. Name the trigger.Say why this base qualifies for the chosen rule.
  3. Make the change.Show exactly what is kept, removed, doubled, or replaced.
  4. Check the boundary.Compare an exception or a near example that does not trigger the rule.

Worked example: city to cities

CITY ends with a consonant followed by Y. For this plural, Y changes to I before ES is added, producing CITIES. KEY keeps Y and adds S because the letter before Y is a vowel.

Use a contrast pair

Study one word that triggers the rule beside one that does not, such as CITY and KEY. Name the exact letter condition before writing either plural. Contrast pairs make the boundary memorable and expose whether you learned the trigger or only copied the example.

Use patterns, meaningful parts, and sentence context to check a form from another angle.

For a worked next step, read how spelling patterns become constraints. Then apply the evidence in Word Pattern Finder.