0 used especially in questions as the subject or object of a verb, when asking which person or people, or when asking what someone's name is: --
1 used as the subject or object of a verb to show which person you are referring to, or to add information about a person just mentioned. It is used for people, not things: --
2 abbreviation for the World Health Organization --
3 used esp. in questions to ask which person or people, or to ask someone’s name: --
Who did this?
Who’s she?
4 used as the subject or object of a verb when referring to a particular person or when adding information about a person just mentioned: --
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
We kunnen het stap voor stap voltooien, hoe lang de weg ook is en het kan niet worden voltooid, hoe kort de weg ook is, als je niet eens je voetafdruk markeert.