I don't need to know the details. 我不需要知道详情。

　　I told you that you don't need to be here. 我告诉过你，你不需要待在这。

　　I don't need you to help me. I can do it myself. 我不需要你帮我，我可以自己完成。

　　I don't need you fighting for us anymore. 我不需要你为我们打架。

　　I can help you finish your homework.  我可以帮你做作业。

　　You don't need to stay here with me.  你不需要和我一起待在这里。