1 . ask sb for sth 向某人要某物或请某人给某物。如：
They asked me for help. 他们向我求助。
He asked her for her address. 他向她要她的地址。
2 . ask to do sth 要求或请求做某事。如：
He asked to see the manager. 他求见经理。
He asked to see whoever was in charge. 他要求见负责人。
He asked to go alone. 他要求一个人去。
3 . ask sb to do sth 请或叫某人做某事。如：
Ask John to mail these letters tomorrow. 叫约翰明天把这几封们寄了。
He asked us to wait for him at the gate. 他叫我们在门口等他
4 . ask about sth 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?
5 . ask after sb 问候某人。如：
They all ask after you. 他们都问候你。
6 . 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。
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