Whatever, whoever, whenever, wherever, however: any... at all
Question word + -ever + clause
Same structure with negation in clause
Rarely used in questions
💡 These can introduce noun clauses or adverb clauses. 'However' can also mean 'but'.
✓Whatever you decide is fine with me.
✗What ever you decide is fine with me.
One word: whatever.
✓Whoever calls, tell them I'm busy.
✗Who ever calls, tell them I'm busy.
One word: whoever.
✓However hard I try, I fail.
✗However hard I try but I fail.
Don't add 'but' after however clause.