虚拟语气我都忘了,希望大家帮帮我做几道相关题,并且简单讲解一下,谢谢

1 People's expectations for a higher standard of living increase ____D____.
A. conditions in their community improve
B. since conditions in their improving community
C. conditions improve in their community
D. as conditions in their community improve 意为”随着社区条件的改善”事实上，这不是虚拟语气的句子，只是含有时间状语的主从复合句。
2 Were there no subjunctive mood, English ____D____ much easier.
A. will be B. would have been
C. could have been D. would be
这是与现在事实相反的虚拟语气在条件从句中的用法。
3 If my lawyer ____A____ here last Saturday, he ____A____ me from going.
A. had been, would have prevented B. had been, would prevent
C. were, would prevent D. were, would have prevented
这是与过去事实相反的条件状语从句与主句。与过去事实相反时从句要用had doen，主句要用would have done的动词形式。
4 Without electricity human life ___D_____ quite different today.
A. is B. will be
C. would have been D. would be
与现在事实相反的从句动词是：过去时；主句的动词形式是：would +动词原形