Sentence ending particle - な - for sure, for real
な is a sentence-ending particle to emphasize a sentence. It can be placed directly after an i-adjective or a verb (in its informal form). It can be placed after a na-adjective or noun by adding だ before な.
The meaning depends on the context and intonation. It can mean the following things
- A sense of admiration
- Adding stress to a sentence
- Conforming a request from the listener.
- Expressing hope (In forms such as 無いかな, といいな, と思うがな)
Note that な is often lengthened to the more emphatic なあ without change in meaning.
I have a headache