would you have called her up had it been possible ? yes,but i ? busy doing my hom

Question

虚拟语气中半虚半不虚，的标志词是哪些？

Answer 1

1. C
由后句but...可知前句为对过去动作的虚拟，所以用would have done sth结构。
单句出现的虚拟语气，除了if only引导的句子之外，都是主句。

2. B
可以省略if的条件状语从句中，被提前的句首词只能是should/were/had，排除ACD.
此题为对将来动作的虚拟。

3．A
so that的虚拟语气，要求其从句谓语由“情态动词 + 动词原形”构成。

4. A
该题从would you have called her up if it had been possible?来看，是对过去动作的虚拟，所以but后面所表示的实际情况发生在过去，所以用过去进行时为最佳答案。

5. B
该题从前句Tom would buy that bicycle是对现在动作的虚拟，所以but后面引导的表示实际情况的句子时态为一般现在时。

6. A
从句意来看，答句是对将来动作的虚拟，所以主句用would do sth.

7．A
had it not been for the policeman = if it had not been for the policeman，表明是对过去的虚拟，所以主句用would have done sth.

8．D
此题but之后为实际的现在的情况，并非虚拟，所以只用have即可。