Rule 1 (by adding -ful )
Help - Helpful, thank -thankful, harm -harmful, more like this: wonderful, playful, careful, useful, hopeful, tasteful, painful
Rule 2 (by adding - less)
Help- helpless, harm-harmless, care-careless, other examples: useless, hopeless, tasteless, countless, endless, priceless,
Rule 3 (by adding -able)
Move- moveable, notice-noticeable, avoid-avoidable, agree-agreeable, others: comfortable, advisable, believable, changeable, desirable, curable, understandable, readable
Rule 4 ( by adding -ive)
Narrate- narrative, explode - explosive, execute-executive, defend-defensive, others: offensive, creative, collective, attractive, respective, active
Rule 5 (by adding -ous)
Envy -envious, labor-laborious, injure-injurious, others:rapturous, torturous, various
Rule 6 (by adding -y or -ly)
Risk- risky, rust-rusty, others: tasty, shiny, icy, oily, sticky, juicy, cloudy, leaky, sleepy
Like-likely, love-lovely, chill-chilly, order-orderly,
Rule 7 (by adding -ish)
Rub - rubbish, fool-foolish, book-bookish
Rule -8 (by making a root verb into past participle or present participle)
break - broken (glass), steal -stolen (jewels), cancel - cancelled (ticket), hear - heard (melodies)
Walk - walking (stick), write -writing (pad), come- coming (month), dance -dancing (competition)