1. Essas palavras significam ‘não importa quem (who), o que (what), qual (which), como (however), quando (when), onde (where)'. Elas são conjunções, embora whoever, whatever e whichever possam funcionar como pronome relativo:

Whoever calls me, tell'em I'm out.
Whatever you say, I won't believe it.
There are a lot of chairs, so you can take whichever you want.
I always eat lots of food, however stewed I am.
Whenever he comes to my house, he drinks my Coke.
Wherever you go, you'll find a bonehead.