It’s necessary that we (should) set out at once.

　　It’s proposed that a committee (should) be set up to look into the matter.

　　It’s only natural that you should be nervous. 你感到紧张是很自然的。

　　The dentist suggested that she (should) come another day.

　　It is highly important that we (should) combine revolutionary sweep with practicalness. "对我们来说,把革命气概和实际精神结合起来是很重要的。"

　　It is impossible that he should have missed the train. 他不可能误车。

　　It’s strange that he should have failed in the exam.

　　2. 在ask, require, order, demand, suggest, propose, command, insist?

　　等动词后的宾语从句中, 动词也用虚拟式, 表示命令、建议、要求等。

　　I suggest that we (should) go camping tomorrow.

　　He insisted that our laboratory reports (should) be handed in the day afterthe experiment was done. 他坚持要求我们在做完实验后第二天将实验报告交上来。

　　He asked that they (should) be allowed to use a dictionary.他要求准许他们用词典。

　　The director required that we should work all night主任要求我们通宵工作。

　　The mayor ordered that free food be distributed.市长命令发放免费食品。

　　The boss demanded that Mary (should) finish it within a week.老板要求玛丽在一周内完成它。