ask sb to do sth 是对的。ask sb for doing sth 就对了，加个介词 for 就对了。
ask sb to do 和ask sb doing的区别，我刚刚做题看到的！ask sb.to do通常要是请求做某事，但没有ask sb,doing sth这种用法。具体分析如下：
ask sb.to do：要求/请求某人做某事。例句：
I asked her to get in touch with Henry as soon as possible.
我要求她尽快与亨利联系。没有ask sb.doing sth的用法，但可以说ask sb in doing sth。ask sb in doing sth：说服某人做某事（具有强制性）。扩展资料：
ask的详细用法如下：
第一种：及物动词 vt.
表询问
He asked him his name.
他问他叫什么。2.表请求
I came to ask you a favor.
我来是想请你帮我一个忙。3.索(价)；要求得到[(+for/of)]
They asked too much of her.
他们对她要求过高。第二种：不及物动词 vi.
1.询问；问候[(+about)]
Why do you ask?你为何要问?2.要求；请求[(+for)]
She asked for a cup of tea.
她要求来一杯咖啡。
ask sb to do sth和ask sb doing sth哪个正确？ask sb.to do sth.是正确的短语，属于固定搭配。1、并没有ask sb.doing sth.这个说法:-doing，do，to，正确
ask sb to do sth和ask sb doing sth哪个正确？ask sb to do sth和ask sb doing sth哪个正确？ask sb to do sth.正确。此为固定搭配，意为，让某人去做某事。一、同上，ask sb to do sth为:-doing，do，to，正确
ask sb to do sth 和 ask sb for doing sth 的区别ask sb to do sth和ask sb for doing sth的区别：意思2113不同5261、用法不同、侧重点不同
一、意思不同
1.ask sb to do sth意思：请求4102某人(不)做某事;叫某1653人干
2.ask sb for doing sth意思：要求某人做某事
二、用法不同
1.ask sb to do sth用法：接以动词不定式充当补足语的复合宾语。也可接双宾语,这时两个宾语都是直接宾语,指物的直接宾语可由名词、代词、带疑问词的动词不定式或wh-从句充当。例句：
I have asked some friends for tea.
我请了一些朋友来喝茶。2.ask sb for doing sth用法：其后可接名词、代词、带或不带疑问词的动词不定式或that/wh-从句作宾语,that从句中常使用虚拟式。例句：
As a student,I want to learn how to ask for not be afraid of doing so.
作为一名学生，我想了解如何寻求帮助，并不要为之怯步。三、侧重点不同
1.ask sb to do sth侧重点：侧重于请求某人独自去做某事。2.ask sb for doing sth侧重点：侧重于请求某人一起去做某事。
ask sb to do sth 是对的
ask sb to do sth
要求某人做某事
ask的详细用法如下：
及物动词 vt.
问;询问[+wh-][O6][O1]
She asked him his name.
她问他叫什么。He asked me where Tom was.
他问我汤姆在何处。请求;要求[+to-v][O2][O1][+that]
He asked that they(should)be allowed to use a dictionary.
他要求准许他们用词典。I came to ask you a favor.
我来是想请你帮我一个忙。I asked her to get in touch with Henry as soon as possible.
我要求她尽快与亨利联系。索(价);要求得到[(+for/of)]
They asked too much of her.
他们对她要求过高。He asked twenty dollars for it.
这件东西他要价二十元。邀请[O][O2]
We have asked the Conrads to come for dinner on Friday evening.
我们已邀请康拉德一家在星期五晚上来吃饭。不及物动词 vi.
问;询问;问候[(+about)]
Tell George my parents ask about him.
转告乔治我父母问他好。Why do you ask?你为何要问?要求;请求[(+for)]
She asked for a cup of tea.
