English Grammar common mistakes | adjectives Tourism can be very benefit to poorer areas. [incorrect] Tourism can be very beneficia l to poorer areas. [correct] In my job, you need the confidence to address large groups of people. [correct] In my job, you need the confident to address large groups of people. [incorrect] Sometimes it is easy to confuse a noun with its adjective. Look at the following list of commonly confused nouns and adjectives: Noun danger age development difference education happiness health maturity nature noise responsibility significance silence sport truth value youth Adjective dangerous aged developed different educational happy healthy mature natural noisy responsible significant silent sports true valuable young Note that invaluable means very valuable ! Men and women can only be used as nouns: More men than women work here . Male and female are used as adjectives: The number offemale employee