Fore as in foretell is both a prefix and a bound morpheme.
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Base refers to the part of word that remains when all inflectional affixes are removed.
A. 对
B. 错
In most cases, prefixes change the meaning of the base whereas suffixes change the word-class of the base.
A. 对
B. 错
Backformation is a productive way of forming nouns in Modern English.
A. 对
B. 错
Inflection is a particular way of word-formations.
A. 对
B. 错