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Word Formation

Prefixes that Change Meaning

Un-, dis-, mis-, over-, under-, re-.

Explanation

Prefixes change meaning without changing the word class. Un- and dis- negate, mis- means wrongly, over- means too much, under- means too little, and re- means again. Choose by convention rather than by rule, since unhappy but dissatisfied, and incomplete rather than uncomplete.

Examples

The report was incomplete.
He misunderstood the instruction.
Prices were overestimated and demand underestimated.

Common mistakes

The report was uncomplete.
The report was incomplete.
Convention decides the prefix.
He disunderstood the instruction.
He misunderstood the instruction.
One prefix per word.
The work must be did again.
The work must be redone.
Re- attaches to the verb form.

More Word Formation

Suffixes that Change Word Class

Noun, verb, adjective and adverb forms.