need somebody to  需要某人做某事

　　I need you to get this done by tomorrow. 我需要你明天之前完成它。

　　Mom, I need you to sign this document. It's for school. 妈，我需要你在这文件上签个名，是学校要的。

　　You really don't need me to live with you. 你真不希望我和你一起住。

　　Do you need me to go on a vacation with you? 你需要我陪你一起去度假吗？

　　Do you need me to stay longer? 你要我多待一会吗？

　　No, we're all finished. You can go.  不用了，我们完事了。你可以走了。