Tri Duc English - Unit 71 ✨ TRI ĐỨC ENGLISH 2026 • Pre-Intermediate UNIT 71 SUFFIXES: FORMING ADJECTIVES LÝ THUYẾT TỪ VỰNG Common suffixes that form adjectives include: -able (comfortable), -al (musical), -y (cloudy), -ous (famous) and -ive (attractive). A. -al Adjectives ending -al are usually formed from nouns, and often mean 'relating to the noun'. a musical instrument (from music) a political issue (from politics) an electrical fault (related to electricity) a personal opinion (the opinion of one person) C. -ful and -less The suffix -ful often means 'full of' or 'having the quality of the noun'. The opposite meaning is sometimes f...