i want to know accent pronunciation ?
like á , é ,í , ó , ú , ü , ñ , and when to use them .
3 Answers
The first five (á, é, í, ó, ú) are pronounced exactly like their unstressed counterparts. The ü is, as far as I know, used to signify that the "u" sound in a syllable like "gui" is supposed to be pronounced instead of mute; other than that it's the regular "u" - for example the "ü" in lingüista is pronounced in the same way you pronounce the "u" in the English word linguist (correct me if I'm wrong about this). The ñ is "soft", you can try the pronunciation tool here at SD or google to hear the difference between regular n and ñ.
As for when to use them, this is something that is learned gradually because there are a lot of different rules for when a certain vowel in a word should be written with a tilde.
There are lots of resources on the internet which describe this in detail, for example:
http://www.spanishdict.com/topics/show/118