Final answer:
The underlined part of the word 'unforgettable' is not the stem. The stem is 'forget', with 'un-' as the prefix and '-able' as the suffix. In words such as 'noticeable', the stem is 'notice', and the final 'e' is kept when adding 'able' to keep the soft 'c'.
Step-by-step explanation:
In the context of the English language and word formation, the stem of a word refers to the main part that gives the word its basic meaning.
To address the question, whether the underlined part of the word unforgettable is the stem of the word is False. The stem in the word 'unforgettable' is actually 'forget'.
The prefix 'un-' is added to give the word a negative meaning, and the suffix '-able' is added to form an adjective, indicating something can be done (in this case, something can be forgotten). In words like noticeable, the stem is 'notice', and even when the suffix 'able' is added, the final 'e' in 'notice' is kept to maintain the soft pronunciation of the 'c'.