guy
The word 'uomo' in Italian is used to refer to a male person, similar to 'guy' in English. However, 'uomo' is also the general term for 'man' or 'human', so context is important to understand the specific meaning.
The man is eating an apple.
This is a basic sentence using the verb 'stare' in its present tense form 'sta', followed by the gerund form of 'mangiare', meaning 'eating', and the noun 'mela', meaning 'apple'. Remember that the article 'una' is used for singular female nouns, but 'un' is used for singular male nouns.
That man is my father.
In this sentence, the word 'Quell'' is the singular form of 'that' for masculine nouns, followed by 'uomo' which means man, 'è' is the third person singular form of 'essere', meaning 'is', and 'mio padre' which means 'my father'.
The man is reading a book.
This is an example of a simple present tense sentence using the verb 'leggere' in its third person singular form 'legge', meaning 'reads', and the noun 'libro', meaning 'book'. Note the use of the indefinite article 'un' which is used before masculine singular nouns.