1. 表示做某事的想法,其后要接 of doing sth作定语,一般不接不定式。如:
I hate the idea of getting old. 我讨厌变老这个想法。
The idea of parachuting out of a plane terrifies me. 一想到要从飞机上跳伞,我就感到很害怕。
其后虽然不直接跟不定式,但有时可接带连接代词或连接副词的不定式。如:
I have no idea of how to do it. 我不知道如何做此事。
I had no idea what to say to her. 我不知道对她说什么。
注意下面一句中idea后的不定式不是定语,而是主语:
It’s not a good idea to come between a man and his wife. 最好不要介入人家夫妻间的事。
2. idea 之后可接一个由 that 引导的同位语从句,用以说明idea的具体内容,此时的 that不能改用 which。