構想;概念[C][U][(+of)]
Have you any idea of what he is up to?
你知道他想干什么嗎?
了解,明白[C][(+of)][+wh-]
I have no idea what to do.
我不知道該怎么辦.
臆測;推量[C][+(that)]
I've an idea that he'll soon quit the job.
我猜想他不久就要辭掉這工作.
意見,見解;信念[(+about/on)][+that]
That at least is my idea about friendship.
至少那是我對友誼的理解.
思想;觀念[C][U]
He destroyed feudal ideas in literature.
他摧毀了文學中的封建思想.