Quoting from [fadee]:
i want to ask, how can i know , that the party who is taking rates from me is a real buyers,
they ask too much question about us, but donot tell any thing them self
how can i know
faddee - The reason they are asking too many questions is probably because they want to make sure that you are real seller. You should also ask them many questions, if they do not answer then they probably are not interested on what you have to offer or possibly that you did not convince them on your product or could be a scammer. Always use proforma invoice when you give quotation to your buyer. Here is a link that could help on how to prepare a proforma invoice. http://resources.alibaba.com/article/29272/Using_a_pro_forma_invoice_will_help_to_increase_your_profits.htm