The policeman ran after the thief quickly. He caught him thanks to his speed and courage.Nouns: policeman ,thiefVerbs: ran ,caught
Adjctives: speed,courage
Pronoun: he,him (personal pronoun )
Adverb: quickly
Conjunction:and
Preposition: after
Article: the
Note: For me all the parts of speech are so important because it gives the sentence form and clarifies its meaning precisely .