ask for与ask about的区别?

ask about sth (sb) 询问有关某人或某事的情况.如：
She asked about his health.她询问他的健康状况.
Can I ask about the exam results?我可以问问考试结果吗?
ask for sth 要求得到某物或要求与某人见面.如：
He asked for some water.他要些水.
A Mr Smith is asking for the manager.一位名叫史密斯先生的人要找经理.
4.ask sb for sth向某人要某物或请某人给某物.如：
They asked me for help.
He asked her for her address.他向她要她的地址.