ask : 最普通用词，指向对方提出要求或请求，长、晚辈，上下级之间都可使用。

　　【英释】If you ask someone to do something, you tell them that you want them to do it.

　　【例句】 We had to ask him to leave.

　　我们不得不要求他离开。

　　beg : 指恳切地或再三地请求或要求，常含低三下四意味，也多用于应酬场合。

　　【英释】If you beg someone to do something, you ask them very anxiously or eagerly to do it.

　　【例句】 I begged him to come back to England with me.

　　我恳求他和我一起回英格兰。

　　demand : 一般指理直气壮地提出强烈要求，或坚持不让对方拒绝的要求。

　　【英释】If you demand something such as information or action, you ask for it in a very forceful way.

　　【例句】Mr Byers last night demanded an immediate explanation from the Education Secretary.

　　昨晚拜尔斯先生要求教育大臣立刻作出解释。

　　require : 强调根据事业、需要或纪律、法律等而提出的要求。

　　【英释】If a law or rule requires you to do something, you have to do it.

　　【例句】The rules also require employers to provide safety training.

　　这些规定还要求雇主提供安全培训。

　　request : 正式用词，指非常正式，有礼貌的请求或恳求，多含担心因种种原因对方不能答应的意味。

　　【英释】If you request something, you ask for it politely or formally.

　　【例句】 Mr Dennis said he had requested access to a telephone.

　　丹尼斯先生说他已经请求使用电话。

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