Use pair comparisons for longer than, then bring the whole set into view for one of the longest. That change gives the exercise a different reasoning task, not just a new suffix to select.
Three original ribbon records
Original illustrative dataset, not measurements from a real class: Cedar is 12 cm, Maple is 18 cm, and Birch is 18 cm. Ribbon names identify objects, not people.
| Comparison context | Supported sentence | Explanation |
|---|---|---|
| Maple and Cedar | Maple is longer than Cedar. | 18 cm is greater than 12 cm. |
| Maple and Birch | Maple is as long as Birch. | Both are 18 cm. |
| All three ribbons | Maple is one of the longest ribbons. | Maple and Birch share the maximum length. |
The key should not accept a claim that Maple is the only longest ribbon. The sentence “Maple is the longest ribbon” can be read without explicitly excluding a tie, so ask for one of the longest in this item to make shared maximum clear. Tell learners that this is the exercise's required wording rather than calling every other phrasing universally ungrammatical.
Separate a form error from an unsupported comparison
For the pair Maple/Cedar, offer longer than, longest than, and more longer than. The key is longer than; feedback names the comparison and explains that the regular comparative already uses -er.
For the full-set item, offer one of the longest, the only longest, and longer than every other ribbon. Only the first fits the declared task. The other two are contradicted by Birch's equal measurement, even though parts of their grammar are recognizable.
Include a short form-only item for interesting → more interesting → most interesting. Keep it separate from the ribbon measurement claim: a ribbon's length does not establish how interesting it is. An irregular-form extension should be added only with a teacher-reviewed key and context.
Give feedback for the selected context
When the learner selects Maple/Cedar, keep those two lengths visible. If they switch to all three, clear the old answer and explanation so the pair answer is not treated as a completed full-set response. Feedback should quote the chosen phrase, name the relevant measurements, and explain the form or evidence issue.
An empty answer is unanswered, not wrong. Retry should let the learner change a choice; reset should clear the choice and explanation while retaining the original dataset. Keep the measurements visible so the learner can reconsider the evidence instead of guessing a different option.
Copy this worksheet prompt
Write an original comparative/superlative practice worksheet in US English.
Learner context: [enter or TO CONFIRM]
Comparison records with names, values, and units: [paste]
Teacher-reviewed adjective forms and allowed answer alternatives: [paste]
Pair/full-set prompts: [paste or ask for clearly labeled proposals]
Create items whose claims are supported by the displayed comparison set.
Separate comparative pairs from superlative full-set contexts. Keep tied
maximum values explicit; do not invent a unique winner. Explain morphology
and evidence separately. State any required phrasing and accept only reviewed
alternatives without falsely declaring other grammatical phrases impossible.
Do not rank people or invent subjective properties from numeric measurements.
Return original items, options, key and feedback. If requested, provide an
HTML local-practice copy with keyboard choices, context selection, retry and
reset. Empty stays unanswered; context changes clear stale feedback; reset
clears answers/explanations. No score collection or ability diagnosis.
Read the dataset and key with another teacher, especially the tie item and its allowed wording. NOS can save and display an HTML worksheet copy for that check. Keep the task's comparison context visible when learners practice, and use their actual explanations to decide whether to revisit adjective form, measurement evidence, or both.