Correct spelling, explanation: the correct form is unforgettable (with two t’s). The word is made up of the prefix un- (meaning not), the root word forget, and the suffix -able (meaning capable of being). In English, when adding a suffix that starts with a vowel (like -able) to a verb that ends in a consonant + vowel + consonant (like forget), we often double the final consonant – but only if the last syllable is stressed. Forget has the stress on the second syllable (for-get), so the t is doubled when adding -able. Unforgetable (with a single -t) is incorrect.

Definition of unforgettable:
Adjective, impossible to forget; very memorable
Our trip to Paris was an unforgettable experience, filled with breathtaking views and delicious food.
Her performance on stage was so powerful that it left an unforgettable impression on everyone in the audience.

Collocations with unforgettable:
Some of the most commonly used collocations include:
1. Unforgettable experience: a very memorable event that leaves a strong impression.
Our trip to the Grand Canyon was an unforgettable experience—we’ll cherish the memories forever.
2. Unforgettable moment: a specific instant in time that is impossible to forget.
Winning the championship was an unforgettable moment in his career.
3. Unforgettable night: a night filled with special events, emotions, or excitement.
The concert was amazing—it was truly an unforgettable night!
4. Unforgettable memory: a strong and lasting memory of something significant.
My grandmother’s stories from her childhood created unforgettable memories for me.

Incorrect spelling, explanation: unforgetable is a mistake because it does not follow standard English spelling rules. The correct form is unforgettable. The base word is forget, which ends in a single -t. When adding the suffix -able, English spelling rules state that if a verb ends in a consonant-vowel-consonant pattern and the final syllable is stressed, the last consonant should be doubled. Since forget has the stress on the last syllable, the -t is doubled, resulting in forgettable and unforgettable when we add the prefix un-.

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