我想请你帮我一个忙

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. 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. 原问题：《“ask sb to do sth”和“ask sb doing sth”怎样区别？》