大学英语：dare作情态动词主要用于否定句、疑问句和感叹句

32.dare作情态动词主要用于否定句、疑问句和感叹句，其否定式是dare not和daren’t,过去式为dared，过去否定式为dared not。Dare not和dared not为正式语言，daren’t普遍使用。

He dared not tell the old woman the bad news because she had a weak heart.

She daren’t ask her boss for leave as he seems to be in a bad mood.

How dare you read my diary!

在肯定陈述句中，dare只有I dare say/daresay这一固定搭配，用于口语，表示“我想”，“我敢说”，“我估计”，“我承认”。

I daresay someone is cooking in the house;it smells delicious.

I daresay we’re going to have a very hot summer this year.

注意：dare做实意动词时，常用于肯定句。

He dared to behave like that in my house!