It isimportant that you arrive there in time.
He insisted that I was wrong.
It was ordered that the medicine be sent here by plane.
请问如此的句子,为何说是虚拟语气? 看着感觉就是普通的句子阿?
It isimportant that you arrive there in time.
【答】isimportant 后面 that 从句的谓语动词要用虚拟语气：不管主语是什么人称，谓语动词都用动词原形，在英国英语中，一般在动词原形前面加 should 。
He insisted that I was wrong.
【答】insisted 表示“坚决倡导；强调”的意思时，后面 that 从句中的谓语动词不需要虚拟语气。如：I insisted to everyonr that she was wrong. 我曾向大伙强调她是错的。（摘自《英汉多功能词典》新编升级版p.874）
insisted 表示“坚决需要；坚持”的意思时，后面 that 从句中的谓语动词要用虚拟语气。如：She insisted that he go alone. 她坚持要他自己去。（摘自《英汉多功能词典》新编升级版p.874）此句可以去掉 should，但go不可以改为其他形式。
所以，“He insisted that I was wrong.”这个句子中没虚拟语气结构。
It was ordered that the medicine be sent here by plane.
【答】在 that the medicine be sent here by plane 这个从句中，划线部分是主语，是单数第三人称，后面的谓语动词是 be sent 原形，说明这是虚拟语气。
