他的朋友坚持说他和毒品无关。

　　2．主语从句的虚拟语气

　　(1)It is＋形容词/名词＋that从句，that从句(主语从句)中谓语动词有时用"(should＋)动词原形"。常见的此类形容词有urgent，necessary，essential，important，appropriate，advisable，preferable，natural，strange等。

　　(2)It is＋过去分词＋that从句，that从句中的谓语动词有时用"(should＋)动词原形"。

　　常见的此类过去分词有：suggested，ordered，desired，proposed，recommended，requested，required，demanded等。

　　It's necessary that we(should)learn English well.

　　我们有必要学好英语。

　　It is required that we(should)finish our work today.

　　要求我们今天完成工作。

　　3．表语从句和同位语从句的虚拟语气

　　在以suggestion，advice，recommendation，demand，order，plan，proposal等表示主张、建议、命令的词引导的表语从句和同位语从句中，从句谓语动词用"should＋动词原形"，should可以省略。

　　His proposal is that we(should)turn off TV for half an hour every day.

　　他的建议是我们每天关闭电视半小时。

　　What do you think of my suggestion that we send a few workers to help other groups?

　　你认为我的那个我们应该派几个工人去帮助其他小组的建议如何？

　　即时跟踪1　用所给动词的正确形式填空

　　1．The judge ordered that the person(should)be__sent(send)for trial.

　　2．Hansen has proposed that I (should)become(become)his business partner.

　　3．Her expression on her face suggested that she was(be)very happy.

　　4．I made the suggestion that they (should)stick(stick)to the plan they had made.

　　5．My advice is that you(should)give(give)up smoking.

6．It's requested that Mr.Black(should)sing(sing)a song at the evening party.