What is the rule called that pertains to doubling the final consonant when adding a vowel suffix?

The rule that pertains to doubling the final consonant when adding a vowel suffix is commonly referred to as "doubling." This rule applies when a word ends in a single vowel followed by a single consonant, especially when the final syllable is stressed. In such cases, the final consonant is typically doubled before adding a vowel suffix, as in the transformation from "run" to "running."

This practice helps maintain the pronunciation of the original word when changing its form. For example, "sit" becomes "sitting" rather than "siting," thus preserving the short vowel sound. Recognizing this rule helps students apply proper spelling patterns when modifying words with suffixes.

The other terms provided do not accurately define this specific spelling rule. "Syllable structuring" generally refers to the organization of syllables in a word, "consonant blending" describes combining multiple consonants at the beginning or end of a word, and "vowel suffix application" does not specifically address the aspect of consonant doubling. Understanding the correct application of this rule will aid students in mastering spelling as they encounter new vocabulary.