attentiveness and involvement in the discussion itself by all present. (for there to be?在句中做目的状语)
It isn’t cold enough for there to be a frost tonight, so I can leave Jim’s car out quite safely.
(for there to be?在句中做程度状语)
There being no further questions, we’ll stop here today. (there being?做原因状语)
(3)引导主语用for there to be。如： It is unusual for there to be no late comers today.
He would always ignore the fact of there being such a contradiction in his inner thought. 六、虚拟语气
主句 从句 与现在事实相反 would/情态动词过去式+do were (不分人称)/did would/情态动词过去式与过去事实相反 +have done 与将来事实相反 would/情态动词过去式+do should do 如：If the doctor had been available, the child could not have died. There is a real possibility that these animals could be frightened, should there be a sudden loud noise. (2)区分主从句表示的不同时间概念：
had done 17
Had it not been for the timely investment from the general public,
our company would not be so thriving as it is. (主句与现在事实相反，从句与过去事实相反)
Had Paul received six more votes in the last election, he would be our chairman now.
Your math instructor would have been happy to give you a make-up examination had you gone and explained that your parents were ill at the time. (句子前半部分为假设情况，而“父母病了”是事实)
I would have gone to visit him in the hospital had it been at all
possible, but I was fully occupied the whole of last week. (前半部分为假设，后半部分是事实) 2.名词性从句的虚拟形式
名词性从句是指宾语从句、主语从句、表语从句和同位语从句。从句的谓语动词需用(should+)动词原形表示虚拟。考生应熟悉： (1)下列动词做谓语时，that宾语从句中的动词用虚拟形式：desire, advise, recommend, command, direct, order, ask, demand, request, require, insist, maintain, move, propose, prefer, urge, vote。
如：In the past men generally preferred that their wives work in the home.
I move that he be discharged for his serious mistake.
advisable, desirable, insistent, preferable, urgent, appropriate, compulsory, crucial, essential, imperative, important, necessary, obligatory, possible, probable, proper, vital, advised, arranged, commanded, demanded, desired, ordered, proposed, recommended, requested, required, suggested。如：
The board deem it urgent that these files should be printed right away.
It is essential that all these figures be checked twice. (3)下列名词接同位语从句或表语从句时，从句中动词用虚拟形式： insistence, preference, recommendation, suggestion, proposal, motion, desire, re-quirement, request, order, necessity, importance, regulation, rule, resolution, understanding。如： John Wagner’s most enduring contribution to the study of Afro-American poetry is his insistence that it be analyzed in a religious, as well as worldly, frame of reference.
They keep telling us it is of utmost importance that our representative be sent to the conference on schedule. 3.含蓄虚拟条件句的谓语动词形式
(1)连词but, but that, or, or else；副词otherwise, unfortunately
如：A safety analysis would have identified the target as a potential danger. Unfortunately, it was never done.
Victor obviously doesn’t know what’s happened; otherwise he wouldn’t have made such a stupid remark.
(2)介词短语暗含假设条件，常用的有：without, but for, under more favorable conditions等。
如：But for the English examination I would have gone to the concert last Sunday.
(3)intended/meant/hoped/wished/planned或was/were +不定式完成式或had intended/meant/planned/hoped/wished +不定式一般式暗示虚拟语气。如：
I intended to have called on you, but I was busy at that time. (4)情态动词完成式暗示虚拟语气。如：
I should have called to make an airline reservation, but I didn’t. 4.常用虚拟形式的句型
would rather would as soon as though suppose… had rather would sooner as if supposing… If only… It is (high) time that…(从句中动词只用过去式) 如：His wife would rather they didn’t talk about the matter any more. I’d rather you went by train, because I can’t bear the idea of your being in an airplane in such bad weather.
If I were in a movie, then it would be about time that I buried my
head in my hands for a cry.
My father always talks as though he were addressing a public meeting.
(2)If it were not for? (与现在事实相反)
If it had not been for? (与过去事实相反) 相当于but for。如： If it had not been for his help (= but for his help), we would not have succeeded.
If only the committee would approve the regulations and put them into effect as soon as possible.
(4)lest/for fear that/in case 从句谓语用(should+)动词原形。如： The mad man was put in the soft-padded cell lest he injure himself. (5)whether?or?有时谓语用be的原形，引导让步虚拟从句，这种用法经常采用倒装结构。如：
Church as we use the word refers to all religious institutions, be they Christian, Islamic, Buddhist, Jewish, and so on.
The business of each day, be it selling goods or shipping them, went quite smoothly. 七、情态动词
(1)must have +过去分词，表示对已发生情况的肯定推测，译为“(昨天)一定??”。如：
My pain must have been apparent the moment I walked into the room,