Test Eighteen
主语从句中的虚拟语气
1)It is(was)+suggested+that+(should)+动词原形。如：
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.
2)It is(was)+形容词+that+(should)+动词原形。
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.
近义词辨析
obvious, apparent, evident, clear
这组词均含有“明显的”的意思。
obvious
指被觉察的东西具有显著特点，不需费力就可觉察到，常用于一目了然的事物。
apparent
意为表面看起来很明显，而实际情况未必如此。
evident
指有证据作出合理判断，考虑到各种事实、条件后而显得明显。
clear
指不存在使人迷惑或使问题复杂化的因素。
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。