dare可以作实义动词,也可以作情态动词.
(1)实义动词dare后面接动词不定式to do.如：
I dare to swim across the river
I don't dare to say that.
Do you dare to go with me?(肯定回答：Yes, I do. 否定回答：No, I don't.)
(2)dare作情态动词时后面接动词原形(不带to的动词不定式).如：
I daren't say that.
Dare you go with me?(肯定回答：Yes, I dare. 否定回答：No, I dare not.)
How dare you say that?
If he dare break the rule , he will be punished .
注意：dare作情态动词时主要用于疑问句,否定句和条件从句中,不用于肯定句(只有一个例外—I dare say,但那是一个固定短语,意思是“我相信, 可能, 我想是这样”).
(3)在否定句或疑问句中,现代英语口语常用实义动词的dare,但省略后面的to,直接接动词原形.如：
I don't dare say that.
Do you dare go with me?
dare 和need做情态动词用时，只能用于否定句，疑问句和条件状语从句中。(特殊用法：I dare to say that和I dare say that 都可以)
Dare可以做实义动词
He dares to do that.
He dares not do that. He doesn’t dare to do that.
注：dare做实义动词时，在否定句中，to可以省略掉。
He dare do that 错：dare当情态动词讲时，不能用于肯定句。
Need doing=need to be done
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