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Grade 4 Lesson 13

Grade 4 Lesson 13. Comparatives & Latin Roots . When we compare two words and show which one is MORE than the other, we are using comparatives. * We use vowel suffix – er to compare. Base Word: More Than: l ate later p retty prettier r ich richer. Comparative Word Forms.

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Grade 4 Lesson 13

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  1. Grade 4 Lesson 13 Comparatives & Latin Roots

  2. When we compare two words and show which one is MORE than the other, we are using comparatives. * We use vowel suffix –er to compare. Base Word: More Than: late later pretty prettier rich richer Comparative Word Forms

  3. When you add a vowel suffix to a base word, you MUST know if the final syllable of the base word has a short or long vowel sound. • DOUBLING RULE: When you hear a base word with a short vowel sound, double the final consonant before adding the vowel suffix. • DROPPING RULE: When you hear a base word with a long vowel sound, drop the silent e before adding the vowel suffix. Adding Vowel Suffixes

  4. DROPPING RULE DOUBLING RULE Base Word w/ Short Vowel Sound big + er = bigger thin + er = thinner slim + er = slimmer • Base Word w/ Long Vowel Sound • late = er = later • bake + er = baker • time + er = timer DOUBLE OR DROP?

  5. We know that a SUFFIX is a VOWEL SUFFIX if the FIRST letter of the suffix is a vowel. • -ing, -er, -ed When you add a vowel suffix to a base word with vowel Y in the final position, you must change the Y to i before adding the suffix unless the suffix begins with the letter i. Base Word: happy + er = happier lucky + er = luckier Changing Rule

  6. When we have a base word, and we add a VOWEL suffix…we check the last 3 letters of the base word. IF we have 2 consonants in the FINAL position of the base word, we can “JUST ADD” the vowel suffix! quick + er = quicker fast + er = faster IF we have a vowel team in the last 3 letters of the base word, we can “JUST ADD” the vowel suffix! (digraph / dipthongow and ou count as a vowel team!) slow + er = slower narrow + est = narrowest “JUST ADD” VOWEL SUFFIX

  7. ACT = DO NAT = BORN • Keywords: action, actor • Keywords: natural, native LATIN ROOTS (WORD PARTS)

  8. DOUBLE:CHANGE:JUST ADD: bigger happier richer thinner thinner quicker slimmer luckier faster shinier lighter DROP: slower later odder ACT:NAT: acted nation native action national natural react SPELLING WORDS

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