Could you please tell me whether the phrase "I don't suppose [something]" is idiomatic? If it is then what is the difference between:
I don't think [something]
I don't suppose [something]
"I don't think" means that you are of the opinion that something isn't the case. " I don't think it is right to borrow money from people."
" I don't suppose" is used as a polite way of asking something, but it sounds formal and probably British: " I don't suppose you could lend me some money?" meaning could you lend me some money?