need to  需要做某事，有必要做某事

　　I need to stay another day. 我得多待一天。

　　Hey, stay there! I need to talk to you. 喂，站住！我得和你谈谈。

　　I need to borrow some money. 我得和你借点钱了。

　　Let's get together. We need to talk about something. 我们见个面吧，得和你说点事情。

　　I have to go. I need to get to work.  我现在得走了，要工作了。

　　Don't forget to take your lunch with you.  别忘了把午餐带着。