This question tests forming and using comparative and superlative adjectives and adverbs (CCSS.L.3.1.g). The base word is quickly and we need the superlative form because we're comparing 3 helpers. Comparative forms (-er or more) are used when comparing exactly 2 things. Superlative forms (-est or most) are used when comparing 3 or more things or choosing one from a group. The number of things being compared determines which form to use. The word quickly is a longer word so we form the superlative by using most. Choice C is correct because it uses most correctly which is proper for comparing 3+ items. The form most quickly follows the rule for longer words. Choice A is incorrect because it adds -er to long word. This error happens when students apply -er/-est to all words. To help students: Teach the 2-vs-3+ rule first: 2 items use -er or more; 3+ items use -est or most. Then teach which words get -er/-est (one syllable like tall→taller→tallest and two-syllable -y words like happy→happier→happiest) vs which get more/most (longer words like beautiful→more beautiful→most beautiful). Memorize irregulars: good→better→best bad→worse→worst. Practice with 'than' for comparative and 'the' for superlative. Watch for: using superlative when only comparing 2 (taller not tallest for 2 people) / adding -er to long words (beautifuler) / forgetting irregular forms (gooder instead of better).

This question tests forming and using comparative and superlative adjectives and adverbs (CCSS.L.3.1.g). The base word is hard and we need the superlative form because we're comparing 3 students. Comparative forms (-er or more) are used when comparing exactly 2 things. Superlative forms (-est or most) are used when comparing 3 or more things or choosing one from a group. The number of things being compared determines which form to use. The word hard is one syllable so we form the superlative by adding -est. Choice B is correct because it uses the superlative -est form which is proper for comparing 3+ items. The form hardest follows the rule for one-syllable words. Choice A is incorrect because it uses comparative when comparing 3+. This error happens when students don't count items being compared. To help students: Teach the 2-vs-3+ rule first: 2 items use -er or more; 3+ items use -est or most. Then teach which words get -er/-est (one syllable like tall→taller→tallest and two-syllable -y words like happy→happier→happiest) vs which get more/most (longer words like beautiful→more beautiful→most beautiful). Memorize irregulars: good→better→best bad→worse→worst. Practice with 'than' for comparative and 'the' for superlative. Watch for: using superlative when only comparing 2 (taller not tallest for 2 people) / adding -er to long words (beautifuler) / forgetting irregular forms (gooder instead of better).

This question tests forming and using comparative and superlative adjectives and adverbs (CCSS.L.3.1.g). The base word is fast and we need the comparative form because we're comparing 2 runners. Comparative forms (-er or more) are used when comparing exactly 2 things. Superlative forms (-est or most) are used when comparing 3 or more things or choosing one from a group. The number of things being compared determines which form to use. The word fast is one syllable so we form the comparative by adding -er. Choice B is correct because it uses the comparative -er form which is proper for comparing 2 items. The form faster follows the rule for one-syllable words. Choice A is incorrect because it uses superlative when comparing only 2. This error happens when students don't count items being compared. To help students: Teach the 2-vs-3+ rule first: 2 items use -er or more; 3+ items use -est or most. Then teach which words get -er/-est (one syllable like tall→taller→tallest and two-syllable -y words like happy→happier→happiest) vs which get more/most (longer words like beautiful→more beautiful→most beautiful). Memorize irregulars: good→better→best bad→worse→worst. Practice with 'than' for comparative and 'the' for superlative. Watch for: using superlative when only comparing 2 (taller not tallest for 2 people) / adding -er to long words (beautifuler) / forgetting irregular forms (gooder instead of better).

This question tests forming and using comparative and superlative adjectives and adverbs (CCSS.L.3.1.g). The base word is good and we need the comparative form because we're comparing 2 books. Comparative forms (-er or more) are used when comparing exactly 2 things. Superlative forms (-est or most) are used when comparing 3 or more things or choosing one from a group. The number of things being compared determines which form to use. This is an irregular form that changes completely (good→better→best). Choice C is correct because it uses the irregular form better which is proper for comparing 2 items. The form better follows the rule for irregular words. Choice A is incorrect because it creates invented irregular form. This error happens when students don't recognize irregular forms. To help students: Teach the 2-vs-3+ rule first: 2 items use -er or more; 3+ items use -est or most. Then teach which words get -er/-est (one syllable like tall→taller→tallest and two-syllable -y words like happy→happier→happiest) vs which get more/most (longer words like beautiful→more beautiful→most beautiful). Memorize irregulars: good→better→best bad→worse→worst. Practice with 'than' for comparative and 'the' for superlative. Watch for: using superlative when only comparing 2 (taller not tallest for 2 people) / adding -er to long words (beautifuler) / forgetting irregular forms (gooder instead of better).

This question tests forming and using comparative and superlative adjectives and adverbs (CCSS.L.3.1.g). The base word is big and we need the superlative form because we're comparing 3 boxes. Comparative forms (-er or more) are used when comparing exactly 2 things. Superlative forms (-est or most) are used when comparing 3 or more things or choosing one from a group. The number of things being compared determines which form to use. The word big is one syllable so we form the superlative by adding -est. Choice B is correct because it uses the superlative -est form which is proper for comparing 3+ items. The form biggest follows the rule for one-syllable words. Choice A is incorrect because it uses comparative when comparing 3+. This error happens when students don't count items being compared. To help students: Teach the 2-vs-3+ rule first: 2 items use -er or more; 3+ items use -est or most. Then teach which words get -er/-est (one syllable like tall→taller→tallest and two-syllable -y words like happy→happier→happiest) vs which get more/most (longer words like beautiful→more beautiful→most beautiful). Memorize irregulars: good→better→best bad→worse→worst. Practice with 'than' for comparative and 'the' for superlative. Watch for: using superlative when only comparing 2 (taller not tallest for 2 people) / adding -er to long words (beautifuler) / forgetting irregular forms (gooder instead of better).

This question tests forming and using comparative and superlative adjectives and adverbs (CCSS.L.3.1.g). The base word is tall and we need the comparative form because we're comparing 2 kids. Comparative forms (-er or more) are used when comparing exactly 2 things. Superlative forms (-est or most) are used when comparing 3 or more things or choosing one from a group. The number of things being compared determines which form to use. The word tall is one syllable so we form the comparative by adding -er. Choice C is correct because it uses the comparative -er form which is proper for comparing 2 items. The form taller follows the rule for one-syllable words. Choice A is incorrect because it uses superlative when comparing only 2. This error happens when students don't count items being compared. To help students: Teach the 2-vs-3+ rule first: 2 items use -er or more; 3+ items use -est or most. Then teach which words get -er/-est (one syllable like tall→taller→tallest and two-syllable -y words like happy→happier→happiest) vs which get more/most (longer words like beautiful→more beautiful→most beautiful). Memorize irregulars: good→better→best bad→worse→worst. Practice with 'than' for comparative and 'the' for superlative. Watch for: using superlative when only comparing 2 (taller not tallest for 2 people) / adding -er to long words (beautifuler) / forgetting irregular forms (gooder instead of better).

This question tests forming and using comparative and superlative adjectives and adverbs (CCSS.L.3.1.g). The base word is bad and we need the superlative form because we're comparing 3 days. Comparative forms (-er or more) are used when comparing exactly 2 things. Superlative forms (-est or most) are used when comparing 3 or more things or choosing one from a group. The number of things being compared determines which form to use. This is an irregular form that changes completely (bad→worse→worst). Choice B is correct because it uses the irregular form worst which is proper for comparing 3+ items. The form worst follows the rule for irregular words. Choice C is incorrect because it creates invented irregular form. This error happens when students don't recognize irregular forms. To help students: Teach the 2-vs-3+ rule first: 2 items use -er or more; 3+ items use -est or most. Then teach which words get -er/-est (one syllable like tall→taller→tallest and two-syllable -y words like happy→happier→happiest) vs which get more/most (longer words like beautiful→more beautiful→most beautiful). Memorize irregulars: good→better→best bad→worse→worst. Practice with 'than' for comparative and 'the' for superlative. Watch for: using superlative when only comparing 2 (taller not tallest for 2 people) / adding -er to long words (beautifuler) / forgetting irregular forms (gooder instead of better).

This question tests forming and using comparative and superlative adjectives and adverbs (CCSS.L.3.1.g). The base word is careful and we need the comparative form because we're comparing 2 students. Comparative forms (-er or more) are used when comparing exactly 2 things. Superlative forms (-est or most) are used when comparing 3 or more things or choosing one from a group. The number of things being compared determines which form to use. The word careful is a longer word so we form the comparative by using more. Choice B is correct because it uses more correctly which is proper for comparing 2 items. The form more careful follows the rule for longer words. Choice A is incorrect because it adds -er to long word. This error happens when students apply -er/-est to all words. To help students: Teach the 2-vs-3+ rule first: 2 items use -er or more; 3+ items use -est or most. Then teach which words get -er/-est (one syllable like tall→taller→tallest and two-syllable -y words like happy→happier→happiest) vs which get more/most (longer words like beautiful→more beautiful→most beautiful). Memorize irregulars: good→better→best bad→worse→worst. Practice with 'than' for comparative and 'the' for superlative. Watch for: using superlative when only comparing 2 (taller not tallest for 2 people) / adding -er to long words (beautifuler) / forgetting irregular forms (gooder instead of better).

This question tests forming and using comparative and superlative adjectives and adverbs (CCSS.L.3.1.g). The base word is beautiful and we need the superlative form because we're comparing 3 drawings. Comparative forms (-er or more) are used when comparing exactly 2 things. Superlative forms (-est or most) are used when comparing 3 or more things or choosing one from a group. The number of things being compared determines which form to use. The word beautiful is a longer word so we form the superlative by using most. Choice A is correct because it uses most correctly which is proper for comparing 3+ items. The form most beautiful follows the rule for longer words. Choice C is incorrect because it adds -est to long word. This error happens when students apply -er/-est to all words. To help students: Teach the 2-vs-3+ rule first: 2 items use -er or more; 3+ items use -est or most. Then teach which words get -er/-est (one syllable like tall→taller→tallest and two-syllable -y words like happy→happier→happiest) vs which get more/most (longer words like beautiful→more beautiful→most beautiful). Memorize irregulars: good→better→best bad→worse→worst. Practice with 'than' for comparative and 'the' for superlative. Watch for: using superlative when only comparing 2 (taller not tallest for 2 people) / adding -er to long words (beautifuler) / forgetting irregular forms (gooder instead of better).

This question tests forming and using comparative and superlative adjectives and adverbs (CCSS.L.3.1.g). The base word is happy and we need the comparative form because we're comparing 2 kids. Comparative forms (-er or more) are used when comparing exactly 2 things. Superlative forms (-est or most) are used when comparing 3 or more things or choosing one from a group. The number of things being compared determines which form to use. The word happy is two syllables ending in -y so we form the comparative by adding -er. Choice D is correct because it uses the comparative -er form which is proper for comparing 2 items. The form happier follows the rule for two-syllable -y words. Choice B is incorrect because it uses more with short word. This error happens when students apply -er/-est to all words. To help students: Teach the 2-vs-3+ rule first: 2 items use -er or more; 3+ items use -est or most. Then teach which words get -er/-est (one syllable like tall→taller→tallest and two-syllable -y words like happy→happier→happiest) vs which get more/most (longer words like beautiful→more beautiful→most beautiful). Memorize irregulars: good→better→best bad→worse→worst. Practice with 'than' for comparative and 'the' for superlative. Watch for: using superlative when only comparing 2 (taller not tallest for 2 people) / adding -er to long words (beautifuler) / forgetting irregular forms (gooder instead of better).