虚拟语气的基本形式共有七种。
1)动词原形，用于一切人称和数。如：
(1)Long live the Communist Party of China! 中国共产党万岁!
(2)If that be so, we shall take action at once. 如果情况是那样，我们就立即采取行动。
2)动词的过去式，用于一切人称和数，be的过去式用were.如：
(3)If you loved me, you wouldn't say that. 假若你爱我，你就不会说这种话。
(4)If I were in your shoes, I'd accept the terms. 假若我处在你的地位，我就会接受这些条件。
3)had+过去分词，用于一切人称和数。如：
(5)We would've called a cab if Harold hadn't offered us a ride home. 假若哈罗德不说要驾车送我们回家，我们就会叫出租车。
(6)If we had left earlier, we wouldn't have missed the train. 假若我们早点起身的话，我们是不会错过火车的。
4)时态助动词should+动词原形，用于一切人称和数。如：
(7)They suggested that we should meet at the station. 他们建议我们在车站会面。
(8)If you should see Celia, give her my best wishes. 假若你见到希莉娅的话，代我向她致以最好的祝愿。
5)时态助动词should+have+过去分词，用于一切人称和数。如：
(9)If the steamer should have left port at noon, it will be passing through the canal now. 轮船如果中午离港，它现在大概正穿过运河。
(10)It is strange that she should have done it. 真奇怪，她竟会干出这种事来。
6) 动词原形。如：
(11)If I were you, I should take his advice. 我如是你，就会听他的忠告。(美国英语常用would代替should)
(12)He said he would go if I went. 他说我去他就去。
7)时态助动词should(第一人称)和would(第二、三人称)+ have+过去分词。如：
(13)If father hadn't sent me, I shouldn't have come. 如不是父亲派我来，我是不会来的。(美国英语常用would代替should)
You wouldn't have seen her if it hadn't been for him. 如果不是他，你就不会见到她。
[注]虚拟时态有不少与直陈语气的某些时态形式相同，但二者的内涵及其所表的时间皆不一样，切不可混淆。
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