Dare (sense 1) usually forms negatives and questions like an ordinary verb and is often followed by an infinitive with to. It is most common in the negative: I didn’t dare to ask. He won’t dare to break his promise. You told him? How did you dare? I hardly dared to hope that she’d remember me.
In positive sentences, a phrase like not be afraid is often used instead:She wasn’t afraid (= she dared) to tell him the truth.
It can also be used like a modal verb, especially in present tense negative forms, and is followed by an infinitive without to: I dare not tell her the truth.
In spoken English, the forms of the ordinary verb are often used with an infinitive without to:Don’t you dare tell her what I said! I didn’t dare look at him.
(not usually used in the progressive tenses) She said it as loudly as she dared.dare (to) do somethingHe didn’t dare (to) say what he thought.They dare not ask for any more money.
fuente : http://oaadonline.oxfordlearnersdictionaries.com/dictionary/dare