LÉPÉS 1Válassza ki a helyes lehetőséget
LÉPÉS 2Tegye az Önnek tetsző gyakorlatokat a Kedvencek közé
Miser i s a noun, and we can't use it as an adjective. The adjective is miserly: She was miserly.
We use an adverb, and not an adjective, to qualify a verb.
After verbs such as look, feel, sound, taste, smell use an adjective instead of an adverb: Sugar tastes sweet (not sweetly).
Fool is a noun, and requires the article when we use it with the verb to be. Foolish is an adjective, and can't be used with the article after the verb to be.
A fool or a foolish person doesn't mean an insane person, but one who acts thoughtlessly. We tend to use silly or stupid instead of foolish in modern usage.