I could really use your help.
帮我一下。
For what?
怎么了?
It begins to gust,I need you to close the window.
起风了,我需要你把窗户关上。
重点讲解:
I need your help.
I could really use your help.
“需要”不一定用need哦,用use也可以。I could really use your help.是比I need your help.更加委婉,客气的请求。如果遇到比较紧急甚至危险的状况,就得直接大呼Help!(救命啊!)