Whatever obstacle is correct and means any obstacle, any at all. Whichever obstacle is also correct but the meaning is different - any of the already mentioned obstacles.
"Whatever" in its traditional sense, such as in "whatever you might think," or "whatever choice you make," is a totally different animal than this kind of teenage use that has spread everywhere and indicates a total dismissal of the line of discussion or the person.
If you go into a public library, you can borrow whatever you want - any book, or any of the videos or CDs if they have them. If you're given a choice of a dozen books, you can borrow whichever you like of that given group. Both words are correct there, but 'whichever' has more of a definite group in mind, whereas 'whatever' is more open.
Hello~. 1a. Whatever time is good for you will be good for me. 1b. Whatever time that is good for you will be good for me. I have heard from two...
Seems fine! "whatever turns you on" is colloquial for whatever you want.
Which sentence is right? I don´t mind, do whatever you want. I don´t mind, do whatever you want to. I don´t mind, do whatever you wanto to do. There are many sentences in which I don´t know if I should use "to" after "want". And here: I have to go to school but I don´t want I have to go to...
Do whatever you want or want to or want to do. - WordReference Forums
No. Whenever is convenient = At whatever time suits you Whenever it is convenient = At whatever time meeting up is convenient