Whenever...

Whatever - Any thing (This could also be every thing)

Whenever - Any time (This could also be 'every time')

Wherever - Any 'where' (Anywhere or everywhere).

Whoever - Anyone (Any person or every person, or sometimes used to refer to a person unknown to the speaker)

Whichever - Any 'which' (Choice between a group or set).

However - Any 'way' (In any manner or way, regardless of how).

Basically each one means: "It does not matter what / when / where etc." OR "An unknown thing / time / place etc."

1. The genie said something like this to Aladin: "I'll give you three wishes… You can wish for whatever (anything) you want and I will give it to you." I know it's one of those cliché questions, but if you could have whatever (anything) you wanted, what three things would you wish for?

2. Whatever you do, just don't touch that red button over there! (This means that you can do anything you want with the exception of touching the red button.) This is often used in giving advice.

3. Wouldn't it be fantastic if we could just take a nap whenever we get tired, no matter where we are?

4. Whenever I get less than six hours of sleep I literally walk around like a zombie the whole day. 

5. "There's no place like home" is an expression which means that wherever you go in the world, you will never find a place quite like your hometown, home city or home country. It will always be a part of you. Do you think you could immigrate and live in another country for the rest of your life?

6. One great thing about Apple products' guarantee, is that wherever you are in the world, you can get your Apple device seen to (serviced) even if you bought it in another country.

7. Whoever came up with the idea to attach an eraser to the end of a pencil was an absolute genius!

8. When the Big Bad Wolf knocked on each of the doors of the three little pigs and asked to be let in (enter), they said to him, "Not on the hair of my chinny chin chin!" In other words, they were saying to him that whoever he was they were not going to let him in.

9. "All roads lead to Rome" is an expression which means that whichever option you choose or route you take, it will give you the same results with a specific goal. 

10. There are an endless number of ways to learn English on your own at home… But however you choose to learn, make sure that it is a fun activity and that you learn consistently.