(interrogative) who; whom (which person?) / (relative) who; whom (the person who) / (indefinite) those who; people who; anyone who

Used other than figuratively or idiomatically: see quem, sabe. / who knows (a rhetorical question asked to show that the asker neither knows the answer nor who might know it) / who knows (asked to express the idea that anything is possible) / when directly followed by a clause: how about (introduces a suggestion)

maybe; perhaps (indicates uncertainty)

Alternative form of quem me dera

expresses that a certain action is very common and everyone has probably done it in the past

slow and steady wins the race (slowness and patience are helpful for achieving a goal)

(idiomatic) Indicates that the speaker is surprised to learn something unexpected about the interlocutor.

spare the rod and spoil the child (if one does not discipline a child he or she will never learn obedience)

whoever (whatever person or people)

you-know-who (known and unmentioned person)