How to pronounce "shan't"?

[denith]

Shan't as Shall not, eventhought its not usually use nowaday, but i just want to know its pronunciation.

[Keo Somala]

Negative contractions like shan't always have a strong pronunciation. There is no weak form of shan't. But note that there is an r sound in shan't which is pronounced in exactly the same way as the r sound in aren't and can't.

http://www.bbc.co.uk/worldservice/learningenglish/grammar/learnit/learnitv184.shtml

[Tdol]

You will still hear it sometimes in British English. ;-)

[Keo Somala]

So why is it still used in British English? 

[Kimlong]

There is no reason at all, but perhaps it is the their original word or they are used to saying it. Therefore, how they give up using it; it's a bit rare though.

[Tdol]

It is mostly used in questions, so it is not that common to hear the negative.  However, there are some uses where you will still hear it:
"I will do it."
"No, you shan't!"
We can use shall/shan't with the second and third persons to show that you are not going to allow something to happen, and in this usage, you will hear the negative being used.

[denith]

Thanks all of you. Best credit goes to Mala.