entreat
/ɪnˈtri:t; ɪn`trit/ v[Tn, Tn.pr, Dn.t]
~ (sth of) sb (fml 文) ask sb (for sth) earnestly and feelingly; beg （为某事）恳求某人; 请求; 乞求
Please don't go, I entreat you. 我求求您, 请不要走.
May I entreat a favour of you? 您能帮帮忙吗?
I entreat you to show mercy. 我求您发发慈悲. =>Usage at ask 用法见ask.