Would you like to learn more about prefixes and suffixes? The prefixes in-, im-, il-, ir-, un-, dis - mean ‘opposite of’ or ‘not’. Prefixes rules and tips: im – begin with ‘m’ or ‘p’ immature, impatient in – begin with ‘c’ incorrect il – begin with ‘l’ illiterate, illegal ir – beginwith ‘r’irregular, irrelevant There are no rules for in–, un– and dis– inter - between interactive, international mis -incorrectly mislead, misspelt over - too much overcook, overweight under - less than undercook, underestimate pre - before prehistoric, pre-war post – after post-election, post-war re - again rewrite, reuse co - together co-operate, co-exist The most common suffixes are -al, -ent, -ive, -ous, -ful, -less Suffixes which form an adjective : -al central, political, national, professional -ent different, dependent, excellent -ive attracti