关于详细用法归纳如下，满意请采纳，谢谢！
【1】ask sb to do sth 请或叫某人做某事
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

We had to ask him to leave. 我们不得不要求他离开。

She said she had been asked to take two suitcases to Africa by a man called Sean.她说有个名叫肖恩的男人要她带两个手提箱去非洲。

【2】ask sb to sth 邀请/约请某人参与某事/到某个地方

Couldn't you ask Jon to the party? 你不能邀请乔恩参加聚会吗？

She asked me back to her house. 她又邀请我去了她家。

【3】ask to do sth要求或请求做某事
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。

I asked to see the Director. 我要求见主任。

【4】ask sb sth询问某人某事

She asked me some strange questions. 她问了我一些奇怪的问题

I asked him his name. 我询问了他的名字

【5】ask about sth (sb) 询问有关某人或某事的情况
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?

【4】 ask for sth 要求得到某物
He asked for some water. 他要些水。

I decided to go to the next house and ask for food. 我决定去隔壁那家要点吃的。

Who asked for your opinion? 谁问你的意见了？

【5】ask for sb要求与某人见面
A Mr Smith is asking for the manager. 一位名叫史密斯先生的人要找经理。

There's a man at the gate asking for you. 门口有个人想见你。

【7】ask sb for sth向某人要某物或请某人给某物
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。

The beggar asked him for bread. 那个要饭的向他要面包吃。

He asked me for my address. 他向我要地址。

【8】ask sth of sb 请求某人某事
She asked a favour of me. 她请求我帮忙 

【9】ask after sb 问候某人(的健康) 
They all ask after you. 他们都问候你(的健康)。

He asked after your health. 他向你问候。