From time to time, I see this type of sentence:
Whatever/However/Whoever... + Clause
Whoever wrote this should win a prize.
But aren't we supposed to put the relative pronoun that (or other relative pronoun) here?
Whatever/However/Whoever... + that + clause
Whoever that wrote this should win a prize.
I think that I hear both types of sentences, too, but I don't know whether:
Only one of which is correct
Both are correct, but there's a rule for their usage.
I'll put some sentences here bellow as examples:
Choose whatever type of chocolate you'd like.
Choose whatever type of chocolate that you'd like
Tell me whichever time suits you best to speak of this issue.
Tell me whichever time that suits you best to speak of this issue.
Give this gift to whomever worked hardest in your point of view.
Give this gift to whomever that/who worked the hardest in your point of view