Voice and Accent Training

How to improve our voice and accent for an interview?

Improving your voice and accent in a day or week is impossible. If you have your interviews in near future then give it your best shot. For long time improvement here are some tips:
1)Mark at least words a day from a dictionary and memorize them and use dictionary keys to learn their pronunciation.
2)Nowadays talking dictionaries are also available. invest in any one.
3)Talk with your friends in the language you want to be fluent in, avoid all other languages. You will learn from your mistakes.
4)Watch the movies in that language extensively and listen to songs in that language & try understanding the lyrics.

What are the basics of Voice and Accent?

Voice and accent these days focus on training you on having a Neutral Accent and training you about the nitty gritties of the country's accent so that you can understand the person.
Also there could be extensive cultural training, so you understand the culture of the concerned country. You could also understand an accent by watching that country's movies.