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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.



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 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.


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.





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.


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 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.

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