What Do You Mean by Prefixes in Grammar?

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This prefix also takes four other forms, depending on the letter it precedes: 1 i- before roots beginning with gn- 2 il- before roots beginning with l- 3 im- before roots beginning with b-, m-, or p- 4 ir- before roots beginning with r-

When do prefixes only attach to certain parts of speech?

In addition, many prefixes are only able (or only tend) to attach to certain parts of speech. For example, the prefix un- (meaning “not”) generally only attaches to adjectives, as in unhappy or uncomfortable; when un- means “to do the opposite of,” it only attaches to verbs, as in uncork or unlock.