- The – Article (Definite article, used before a noun)
- cat – Noun (Subject of the sentence)
- quickly – Adverb (Describes how the action is done)
- ran – Verb (Action word, describing what the cat is doing)
- across – Preposition (Shows the relationship between the cat and the street)
- the – Article (Definite article, used before the noun)
- street – Noun (Object of the preposition "across")
