However, they are used in slightly different contexts:
* in- is used before words beginning with a consonant sound, like:
* inaccurate (not accurate)
* incomplete (not complete)
* insecure (not secure)
* im- is used before words beginning with a vowel sound or an "m" sound, like:
* imperfect (not perfect)
* impossible (not possible)
* immoral (not moral)
Important Note:
While the rule about consonant and vowel sounds is a good guideline, there are exceptions. Some words may use in- before a vowel sound (e.g., inability) or im- before a consonant sound (e.g., impassioned).
It's always best to check a dictionary for the correct prefix usage in specific words.