ask sb to do sth和ask sb doing sth

英语老师好像教过我们，有时候ask sb 的后面跟to do sth，有时候ask sb 的后面跟doing sth问一下这两个词组怎样区别开来

ask sb doing sth没有这种用法，就只有ask sb to do sth的用法。

没有ask  sb  doing  sth  的用法  

应该是 ask sb to dosth

没有ask sb doing sth这种用法

只有ask sb to do sth，后面那种用法是不存在的。

ask的详细用法如下：

及物动词 vt.

1. 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。 2. 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。 3. 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。 4. 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.

1. 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? 2. 要求;请求[(+for)] She asked for a cup of tea.

好像没ask sb doing sth 我学这么多年都没用过