I know really is an adverb, and one that intensifies the verb. I also know that some adverbs go only in the beginning; in the middle or at the end of a sentence, and some can be placed in all three positions.
Take for example the phrase: I don't care
I really don't care
I don't really care
I don't care really
These three sound OK, but maybe I'm wrong? Could someone please describe the differences in meaning?
Ws2 suggested using don't know with quite in the comments below.
I quite don't know
I don't quite know
I don't know quite
Only the second one sounds acceptable. Why is that?