I could really use your help.
幫我一下。
For what?
怎么了?
It begins to gust,I need you to close the window.
起風了,我需要你把窗戶關上。
重點講解:
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,客氣的請求。如果遇到比較緊急甚至危險的狀況,就得直接大呼Help!(救命啊!)