should do / were to do
如：If the doctor had been available, the child could not have died.
There is a real possibility that these animals could befrightened, should there be a sudden loud noise.
Had it not been for the timely investment from the general public,our company would not be so thriving as it is.
Had Paul received six more votesin the last election, he would be our chairman now.
Your math instructor would have been happy to give you a make-upexamination had you gone and explained that your parents were ill at the time.
I would have gone to visithim in the hospital had it been at all possible, but I was fully occupied thewhole of last week.
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 thehome.
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 rightaway.
It is essential that all these figures be checked twice.
insistence, preference, recommendation, suggestion, proposal,motion, desire, requirement, request, order, necessity, importance, regulation,rule, resolution, understanding。如：
John Wagner’s most enduring contribution to the study ofAfro-American poetry is his insistence that it be analyzed in a religious, aswell as worldly, frame of reference.
They keep telling us it is of utmost importance that ourrepresentative be sent to the conference on schedule.
(1)连词but,but that, or, or else；副词otherwise, unfortunately等表示转折假设。如：
A safety analysis would have identified the target as a potentialdanger. Unfortunately, it was never done.
Victor obviously doesn’t know what’s happened; otherwise hewouldn’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 concertlast Sunday.
+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.
would rather would assoon asthough suppose…
hadrather would sooner asif supposing…
Ifonly… It is (high) time that…(从句中动词只用过去式)
如：His wife would ratherthey didn’t talk about the matter any more.
I’d rather you went by train, because I can’t bear the idea ofyour being in an airplane in such bad weather.
If I were in a movie, then it would be about time that I buried myhead in my hands for a cry.
My father always talks as though he were addressing a publicmeeting.
(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 nothave succeeded.
If only the committee would approve the regulations and put theminto 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 injurehimself.
Church as we use the word refers to all religious institutions, bethey Christian, Islamic, Buddhist, Jewish, and so on.
The business of each day, be it selling goods or shipping them,went quite smoothly.