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.