One person start to learn english for a short time.One day,he was walk in the street,he stepted on a foreigner`s foot.He said "i am sorry."And then,the foreigner said"I am sorry too"for polite.After that,the man said"I am sorry three". The foreigner heard that and didn`t know what he meant asked“what are you sorry for?"The man said helplessly"I am ssorry five."