1
You must have you car serviced every year or every 10.000 km WHOEVER/WHEREVER/WHICHEVER happens first.
2
As I only need a computer to work, I can do it from WHEREVER/WHATEVER/WHENEVER I want.
3
We must do WHEREVER/WHATEVER/HOWEVER is necessary to bring the attackers to justice.
4
You can ask me WHATEVER/WHENEVER/WHEREVER you have a question.
5
"Whenever" is just another way to say "ANYTHING/ANYBODY/ANYTIME"
6
"Whichever" is different from "Whatever" because in the first case we are talking about OPTIONS/PEOPLE/QUESTIONS
7
in the sentence "Whoever finishes first is going to win a prize", the word whoever can be replace with "NOBODY/SOMBODY/ANYBODY"
8
You can arrange the furniture HOWEVER/WHICHEVER/WHATEVER you want
9
WHOMEVER/WHICHEVER/WHOEVER took the decision is the responsible for what has happened.
10
The word WHEREVER is used to express that the TIME/PLACE/PERSON is not important or not known
