That depends on the language where it's used. In Scandinavian languages, it forms the definite article on non-neuter nouns (Swedish: bil "car", bilen "the car"). In German and Dutch, it is the mark of the infinitive (werken, leben, gehen). In English it's sometimes used for the past participle in irregular verbs (forget - forgotten), sometimes to make adjectives out of nouns (wood - wooden). I imagine it features in many other languages as well, with different functions.
The suffix for "straight" is "-en."
The suffix for "garden" is "-en."
The suffix to "unwritten" would be "-en."
The suffix for "broad" is "-en" or "-en" when forming the comparative and superlative forms, such as "broader" and "broadest."
The correct suffix for softening is -en.
En is the suffix of enjoy
The suffix for "straight" is "-en."
The suffix for "garden" is "-en."
The suffix to "unwritten" would be "-en."
The suffix for "broad" is "-en" or "-en" when forming the comparative and superlative forms, such as "broader" and "broadest."
The correct suffix for softening is -en.
en
en
The suffix for "rewritten" is "-en." The base word "write" becomes "written" when the past participle suffix "-en" is added to indicate that the action has been completed. Therefore, "rewritten" means that something has been written again or revised from its original form.
The prefix for "wide" is "un-" and the suffix is "-en."
The prefix of ensure is "en-" and the suffix is "-ure".
The prefix of dishearten is "dis-" and the suffix is "-en".