Rule 9 is referred to as the 1:1:1 rule. When we want to add a vowel suffix to a 1 syllable word with 1 vowel followed by 1 consonant (not in the black box - w, x, y -) we double the final consonant and add the vowel suffix.
For example: hop + ing = hopping and stop + ed = stopped.
If a one syllable word with 1 vowel ends in w, x or y we do not double the consonant. We just add the vowel suffix.
For example: wax + ing = waxing, saw + ing = sawing and try + ing = trying.
Watch the tutorial videos below to see how the Spelling Tools, Spelling Rule 9 and Reading Tools are used to spell challenging words.
Special Note:
Not all words will follow the spelling rule. These are called exceptions. If 90% or more words follow this rule then this is still a great tool to help become a proficient speller. Language experience will deal with the rest.