• Dare (sense 1) usually forms negatives and questions like an ordinary verb and is followed by an infinitive with to. It is most common in the negative. * dare（第 1 义）通常与一般动词一样构成否定式和疑问式，后接带 to 的动词不定式，最常用于否定句中：◆I didn't dare to ask. 我不敢问。◆He won't dare to break his promise. 他不敢食言。◆You told him? How did you dare? 你告诉他了？你竟敢？◆I hardly dared to hope she'd remember me. 我几乎不敢指望她会记得我。 In positive sentences a phrase like not be afraid is often used instead. 在肯定句中常用 not be afraid 代替：◆She wasn't afraid(= she dared) to tell him the truth. 她敢对他讲实话。
• It can also be used like a modal verb especially in present tense negative forms in BrE, and is followed by an infinitive without to. * dare 亦可以情态动词方式使用，尤其在英式英语中的现在时否定式，后接不带 to 的动词不定式：◆I daren't tell her the truth. 我不敢对她讲实话。
• In spoken English, the forms of the ordinary verb are often used with an infinitive without to. 在英语口语中，此普通动词的各种形式常与不带 to 的不定式连用：◆Don't you dare tell her what I said! 谅你不敢告诉她我说的话！◆I didn't dare look at him. 我不敢看他。

• The modal verbs are can, could, may, might, must, ought to, shall, should, will and would. Dare, need, have to and used to also share some of the features of modal verbs. * can、could、may、might、must、ought to、shall、should、will 和 would 均为情态动词。dare、need、have to 和 used to 亦具有情态动词的某些特性。
• Modal verbs have only one form. They have no -ing or -ed forms and do not add -s to the 3rd person singular form. 情态动词只有一种形式，没有 -ing 或 -ed 形式，第三人称单数也不加 -s：◆He can speak three languages. 他会说三种语言。◆She will try and visit tomorrow. 她明天将设法去参观。
• Modal verbs are followed by the infinitive of another verb without to. The exceptions are ought to, have to and used to. 情态动词后跟不带 to 的动词不定式，但 ought to、have to 和 used to 例外：◆You must find a job. 你必须找到一份工作。◆You ought to stop smoking. 你应当戒烟。◆I used to smoke but I gave up two years ago. 我过去抽烟，但两年前就戒了。
• Questions are formed without do / does in the present, or did in the past. 疑问句现在时不用 do/does，过去时不用 did：◆Can I invite Mary? 我可以邀请玛丽吗？◆Should I have invited Mary? 我本该邀请玛丽吗？
• Negative sentences are formed with not or the short form -n't and do not use do / does or did. 否定句用 not 或简约式 -n't，不用 do/does 或 did。

You will find more help with how to use modal verbs at the dictionary entries for each verb. 情态动词的不同用法可参考本词典里各情态动词词条。