someone
The Italian word 'qualcuno' translates to 'someone' in English. You use it in the same way you would use 'someone' in English, to refer to an unspecified person. For example, you might ask, 'Hai visto qualcuno?' which translates as, 'Did you see someone?'
Someone called while you were out.
This sentence is using 'qualcuno' to refer to an unspecified person. The entire phrase is in past tense, indicating that the calling event happened at a specified time in the past when you were not present.
Someone among my friends is coming to the party tonight.
In this sentence, 'qualcuno' is used to indicate a vague referent out of a specific group, in this instance, the speaker's friends. The sentence is in the present tense, indicating ongoing or forthcoming action.
I need someone to help me with the homework.
This phrase includes 'qualcuno' to refer to a non-specific entity capable of providing assistance. It expresses a necessity and is structured as a statement of need.