In poetry or formal writing, 'whose' is used to show possession in a stylized way. It often appears in famous expressions or literary works.
Whose woods these are I think I know. (poetic)
Whose fate it is to fall, only time will tell.
'Whose' can connect two ideas by showing that one thing belongs to someone. It replaces 'of whom' or 'belonging to whom'.
I know a man whose dog is very big.
She met a girl whose father is a doctor.
'Whose' asks about ownership, not only for people but also for objects or ideas. It is used in questions to find the owner.
Whose idea was this for the project?
Do you know whose keys these are?
Sometimes 'whose' is used before a noun to show that the noun belongs to someone. This is common in formal or written English and less in everyday speech.
Whose hands made this beautiful chair?
I saw a man whose eyes shone bright.
People use 'whose' informally when they want to know the owner of something near or that just appeared. It is common in spoken English.
Whose is this bag here?
Whose phone rang just now?
