It is all right to ask direct questions to your classmates.question后的介词to是怎么回事儿？辞书上是ask sth of sb，盼望专家老师解惑，谢谢。

回答如下：

询问某人问题：ask sb +(a/an+adj.)+question 只可以用这个结构，其它不正确.

【1】 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?
【2】 ask after sb 问候某人(的健康)
They all ask after you. 他们都问候你(的健康)。
【3】 ask for sth 要求得到某物或要求与某人见面
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
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。
 【5】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。
【6】. 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。

【7】ask in 请(某人)进来

Mr.Brown is at the door, shall I ask him in?

布朗先生在门口,我可以请他进来吗?

I asked him in for a drink.我请他进来喝点饮料。

【8】ask sb out 请(某人)外出

Mr. and Mrs. Brown are not at home, some friends have asked them out.

布朗先生和布朗太太都不在家,有几个朋友邀他们出去了。

I asked her out to lunch.我请她出去吃饭。

This is the third time he asked me out.这是他第三次请我外出。

【9】ask of sb向…要求,要求

It's not too much to ask of you to clean your own shoes.

让你刷自己的鞋,这要求并不过分。

You are asking too much of them.你对他们要求太高。

She's not strong.We can't ask too much of her.她身体比较弱,对她要求不能太高。

You asked of me more than you asked of the others.你要求我的比要求别人的多。

【10】ask sth of sb/sth要求某人某事

I would like to ask a favour of you.我想求你帮个忙。

I asked my way of a passer-by.我向一位过路人问了路。

He asked my opinion of the pictures.他请我对那些画提提意见

【11】ask sb over 请(某人)来自己家

I asked her over to my house.我邀请她到我家来。

They asked us over to dinner.他们邀请我们到他们家吃饭。

We haven't seen them for ages; why not ask them over for lunch on Sunday?

我们很久没有见到他们了,何不星期天请他们到家里吃午饭呢?

【12】ask sb to sth邀请…参加

Do I have to ask all my relatives to the wedding?

我必须邀请所有的亲戚参加婚礼吗?

They asked me to their wedding party.

他们请我参加他们的婚礼。

When Jerry asked me to her house I usually made some excuse.

每当杰瑞请我到她屋子里去时,我总是借口推托。

I am asked to more social affairs than I have time to attend.

邀请我参加的社会活动太多,我没有时间都去参加。

【13】ask  sb up 请(某人)上楼

Please ask him up.请把他请到楼上来。

They asked me up.他们把我请到了楼上。