Grammar Point 语法说明needneed需要

There are two separate verbs need.有两个各不相同的动词 need。
Need as a main verb has the question form do you need?, the negative you don’t need and the past forms needed, did you need? and didn’t need. It has two meanings: 1. to require something or to think that something is necessary:need 作主要动词时，疑问式为 do you need?，否定式为 you don't need，过去时为 needed、did you need? 和 didn't need。其含义有二： 1. 需要或认为有必要
- Do you need any help?你需要帮忙吗？
- I needed to get some sleep.我需要睡一会儿。
2. to have to or to be obliged to do something:必须或一定要
- Will we need to show our passports?我们要出示护照吗？
Need as a modal verb has need for all forms of the present tense, need you? as the question form and need not (needn’t) as the negative. To talk about the past, use the perfect forms need have and needn’t have with the past participle. It is used to say that something is or is not necessary:need 作情态动词时，现在时均作 need，疑问式为 need you?，否定式为 need not (缩略式为 needn't)。谈论过去的事情，要用完成式 need have、needn't have 加过去分词，用以表示某事有必要或没有必要
- Need I pay the whole amount now?我必须现在全部付清吗？

Grammar Point 语法说明needneed需要

There are two separate verbs need.有两个各不相同的动词 need。
Need as a main verb has the question form do you need?, the negative you don’t need and the past forms needed, did you need? and didn’t need. It has two meanings: need 作主要动词时，疑问式为 do you need?，否定式为 you don't need，过去时为 needed、did you need? 和 didn't need。其含义有二：

1. to require something or to think that something is necessary: 需要或认为有必要

2. to have to or to be obliged to do something:必须或一定要

Will we need to show our passports?我们要出示护照吗？
Need as a modal verb has need for all forms of the present tense, need you? as the question form and need not (needn’t) as the negative. To talk about the past, use the perfect forms need have and needn’t have with the past participle. It is used to say that something is or is not necessary:need 作情态动词时，现在时均作 need，疑问式为 need you?，否定式为 need not (缩略式为 needn't)。谈论过去的事情，要用完成式 need have、needn't have 加过去分词，用以表示某事有必要或没有必要
- Need I pay the whole amount now?我必须现在全部付清吗？