名詞性從句是指賓語從句、主語從句、表語從句和同位語從句。從句的謂語動詞需用(should+)動詞原形表示虛擬�？忌鷳煜ぃ�
(1)下列動詞做謂語時醫(yī)學全在,線f1411.cn，that賓語從句中的動詞用虛擬形式：
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.
(2)下列形容詞和分詞做表語或補語時，that主語從句中動詞用虛擬形式：
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)下列名詞接同位語從句或表語從句時，從句中動詞用虛擬形式：
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 f1411.cn 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.含蓄虛擬條件句的謂語動詞形式
含蓄虛擬語氣是指假設(shè)條件不通過if從句表達，而是暗含在其他結(jié)構(gòu)中。考生應熟悉：
(1)連詞but, but that, or, or else;副詞otherwise, unfortunately等表示轉(zhuǎn)折假設(shè)。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.
