It is proposed that more selective courses be offered next year.
It has been decided that a special committee be formed to supervise the work.
该句式中的形容词一般包括：advisable, appropriate, desirable, essential, important, imperative, necessary, impossible等。例如：
It is important that the students take brief notes while listening to the lecture.
It is essential that all the facts be examined first.
obvious, apparent, evident, clear
It was an obvious mistake for him to have gone alone.他独自一人去，这是一个明显的错误。
It was becoming increasingly apparent that he disliked me.他不喜欢我这一点变得越来越明显。
The applause made it evident that the play was a hit.掌声明显地表明这部剧引起了轰动。
The situation is clear to everyone.局势大家都清楚。