żeby.

creates a subordinate clause expressing desire or wish; to, so that, for that, in order to

Chcę, żebyś ciężej pracował!

creates a subordinate clause in which the speaker believes the following event would be good; to, that, had better, may

Żeby mnie nie zabiło!

creates a subordinate clause expressing aim or purpose, one's goal; to, so that, for that, in order to

Czytam, żeby się uczyć.

creates a subordinate clause expressing expressing means by which something is achieved; to, so that, for that, in order to

creates a subordinate clause in which one states the possibility of something depends on something else; to, so that, for that, in order to

Zjadłem za dużo, żeby teraz biegać.

creates a subordinate clause expressing the speaker's position on the truthfulness of a given situation

Żebyś wiedział!

creates a subordinate clause emphasizing that the speaker thinks the contents of their statement are apt

żeby nie wiem co

creates a subordinate clause expressing doubt; that, if

Nie wiem, żeby...

creates a subordinate clause expressing the speakers doubt with relation to the goodness of a given event; roughly, to think that

żeby też

ale żeby

creates a subordinate clause that expresses a lack of results; for the sake of

gadać, żeby gadać

creates a subordinate clause in which the speaker thinks something else should be reality rather than what truly is; so that, may; if only

introduces a subordinate clause relating a following event with a previous one that is not caused by the first event; just to, only to

Uciekał przez trzy lata, żeby skończyć w więzieniu.

introduces a second action co-occurring with another; to

żeby tak powiedzieć

creates a subordinate clause expressing consequences; or else