In every case, an adverb comes after the verb and in every case that’s obviously the wrong choice. All those sentences need an adjective: He is nice. We are hungry. I am sad.

Learning resources, including a video and downloadable worksheets for adults about what grammar and what are word types. ... like verbs and adverbs, nouns, adjectives and connectives, ...

The verb in that sentence is 'ate'. An adverb is a word that describes the verb. The adverb in this sentence is 'quickly'. It tells us how Zak ate his breakfast.