May I ask a favour of you? 能不能请你帮个忙?
It is hoped you will give us guidance. 请你多加指导。
send for a doctor; 请医生
invite the chief engineer to give a lecture; 请总工程师来讲课
We entertained friends to lunch. 我们请朋友吃午饭。
Be quiet, please. 请安静。
Please don't laugh. 请不要笑。
牛津高阶第八版
美国韦氏词典
Dictionary.com
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维基百科 (自由的百科全书)