Check the whole resulting form.
Review happiness, argument, noticeable, achievable, sincerely and loneliness by comparing what changes and what stays in each complete form.
Six original recognition items each count one correct choice. Your count out of six describes these words on this attempt, not a percentile, school grade, CEFR level or writing score. Every answer and this complete guide are free at every count.
Six specified resulting forms
Happiness and loneliness change a final y to i before ness in these forms. Argument has no e between u and m. Noticeable retains e before able, while achievable drops the final e of achieve. Sincerely retains the e of sincere before ly. These contrasts explain the selected words. They do not establish a suffix rule with no exceptions for every English word.
Compare noticeable and achievable
Write noticeable as n o t i c e a b l e and achievable as a c h i e v a b l e. The first has ea before ble; the second has va before ble. Always retaining the final e of a base word would produce a wrong answer for achievable, while always deleting it would produce a wrong answer for noticeable. Check the full target rather than one automatic operation.
Track the earlier letters too
An ending can look right while an earlier sequence is wrong. Achievable retains ie near the start; loneliness retains the earlier e as its final y changes. Happiness still needs pp and final ss. Compare every letter in your selection against the explanation. Distinguish a base-form change from an unrelated extra letter so that your next exercise addresses the actual error.
Build a small comparison card
Make three rows using only words from this group: one y-to-i pair, the contrasting able forms and sincerely. On each row, mark the exact retained or removed letter. Cover the resulting words, place each into a new sentence, then compare with the card. Avoid treating a successful repeat of the same options as a new writing assessment or proof of lasting improvement.
Use the count to select review, not a level
The group contains six recognition decisions, with all English sentences and options preserved in both interface languages. It does not measure grammar, productive vocabulary, academic readiness or job suitability. No CEFR mapping, age norm or hiring cutoff is established. Reading an explanation can help identify a letter difference; it does not certify that the word will be produced correctly in another setting.