Need is used both as an ordinary verb and as an auxiliary verb.
As an ordinary verb
As an ordinary verb need is used in the sense of ‘require’. It has the usual forms needs and needed. Ordinary need is followed by an infinitive with to.
- One needs to be punctual.
- Everybody needs to be loved.
- He needed some more time to decide the question.
Questions and negatives are made with do.
- Do you need to go now?
- I don’t need to talk to him.