The possessive adjective for someone.

someone is / someone has

Used as an intensifier for actions causing harm or detriment to someone / Used to indicate that an action normally beneficial may be performed in a way that causes harm or detriment to someone.

A partially specified but unnamed person. / an important person

(MLE) This is what (the named person) said or did; used in recounting events, etc.

plural of someone

person who is not known or named

(idiomatic) Being someone's liability or responsibility; with which someone is lumbered. / (idiomatic) Available to be used by someone; in someone's possession.

(idiomatic, mostly used conditionally) in someone's situation.

(informal) One's decisions or actions will bring undesirable consequences only on oneself.