fool

That was a fool thing to do, and now we have no tickets for the concert.

用法提示：此处 fool 是形容词，修饰 thing，意为“愚蠢的”。

She was fool enough to trust a stranger with her address.

用法提示：fool enough 结构，形容词作表语，意为“傻到……”。

Don't ask such fool questions in class.

用法提示：fool 在此为形容词，修饰 questions，表示“愚蠢的”。