Whichever, however, whatever

Whichever, however, whatever
 

These conjunctions introduce conditions which always seem to obtain and cannot seem to be changed.
Can anybody explain to me the meaning of this definition, or can you paraphrase it?

Whatever and whichever are like cualquiera en Spanish.

How ever can mean cómo but with more urgencey. Example: How ever will they solve that problem in the Gulf of Mexico.

However means something between but and nevertheless. (pero y no obstante)

However is a synonym of "but" or "pero".

I would go to the store, however, my car is broken.

Then Poli.

How ever means como but in a situation more urgent.

I can use the phrase in the following instances.

Please don't hesitate to correct me.

How ever you most fix my car right now, because I need to have my car this afternoon.

Here you can see that it's more seems of a command than a suggestion.

I will be grateful for your support.

There you go Croalito, I rewrote it a little more naturally above in green.

Thank you for the corrections.

Yes perhaps I need to write more nature.
You rewrote my example and well they seems like.