18. Form the adjectives from the words given below. Fill in the table.
(-al, -able, -ary, -ful, -ive)
Dispute, force, nation, protection, government, harm, custom, equity, law, execution, supplement, power, decision, value, knowledge, parliament, accident, peace, legend, president, environment.

Disputable, forceful, national, protective, governmental, harmful, customary, equal, lawful, executive, supplementary, powerful, decisive, valuable, knowledgeable, parliamentary, accidental, peaceful, legendary, presidential, environmental.