以下是小编帮大家整理的大学英语四级语法精要：虚拟语气-在某些句型中，本文共7篇，仅供参考，欢迎大家阅读。
篇1：大学英语四级语法精要：虚拟语气-在某些句型中
在某些句型中
it is time that
it is time that we went (或should go) to bed.
it is high time we (should) put an end to this controversy.
as if (though) 引起的从句:
they talked (are talking) as if they had been friends for years.
it seems as if it was (were) spring today.
he acts (acted) as if (though) he were (was) an expert.
以lest, for fear that 和 in case 引起的从句(这时谓语多用 should +动词原形):
he took his raincoat with him lest it should rain.
he put his coat over the child for fear that (或lest) he should catch cold.
i’ll keep a seat for you in case you should need it.
以whatever, whoever, no matter what这类代词或词组引起的从句(这时, 谓语多用may加动词原形构成):
whatever defects he may have, he is an honest man.
come what may, we will go ahead. 不管发生什么情况, 我们都要干下去.
i accept that he is old and frail; be that as it may, he’s still a good politician.
我承认他年老体衰, 然而尽管如此, 它仍是优秀的政治家.
篇2：大学英语四级语法精要：虚拟语气-条件句
条件句
虚拟条件句主要有下面两类:
表示现在及将来情况(表示纯然假设或实现的可能性不大的情况):
谓语主要形式如下(be多用were这个形式):
| 从句 | 主句 |
| 过去式 | would + 动词原形 |
how nice it would be if you could stay a bit longer.
表示过去情况的虚拟条件句(与事实完全相反的假设情况), 谓语主要形式如下:
| 从句 | 主句 |
| had + 过去分词 | would have + 过去分词 |
if i hadn’t taken your advice, i would have made a bad mistake,
you wouldn’t have caught cold if you had put on more clothes.
有时候, 条件从句表示的动作和主句表示的动作, 发生的时间是不一致的(如一个是过去发生的, 一个是现在发生的). 这时, 动词的形式要根据表示的时间来调整. 这种句子可以称为错综。
篇3：大学英语四级语法精要：虚拟语气-that从句中
Ⅲ 虚拟语气
that从句中:
wish, would rather (sooner), had better:
i wish i were as strong as you.
i wish i had paid more attention to our pronunciation.
i wish i remembered the address.
i would rather they came tomorrow (you had gone there too).
i had rather (that) you told him than i did.
suggest, order, demand, propose, command, request, desire, insist 等动词后的宾语从句:
the commander ordered that all civilians (should) be evacuated.
he asked that he be given an opportunity to try.
she urged that he write and accept the post.
it is desired, it is suggested, it is requested, it was ordered, it was proposed, it is necessary, it is important, it has been decided 等结构后的主语从句中.
it was arranged that they leave the following week
it will be better that we meet some other time.
suggestion, motion, proposal, order, recommendations, plan, idea等后面的表语从句和同位语从句:
his sole requirement is (was) that thy system be adjusted.
篇4：大学英语四级语法精要：虚拟语气-时间条件句
时间条件句
if he had received six more votes, he would be our chairman now.
if we hadn’t got everything ready by now, we should be having a terrible time tomorrow.
有时假设的情况并不以条件从句表示, 而是通过一个介词短语来表示.
without music, the world would be a dull place.
we could have done better under more favorable conditions.
that would have been considered miraculous in the past.
but for the storm, we should have arrived earlier.
如果条件句从句中包含有 were, had, should 或could, 有时可把if省略掉, 并把were, had, should或could放在主语前面.
had we made adequate preparation, we might have succeeded.
should there be a flood, what should we do?
were it not for their assistance, we would be in serious difficulty.
篇5：大学英语四级语法精要：分词
分词
意义: 过去分词通常来自及物动词, 带有被动意义和完成意义; 而现在分词有的来自及物动词, 有的来自不及物动词, 通常带有主动意义和未完成意义.
frozen food a freezing wind
a bored traveller a boring journey
a lost cause a losing battle
a conquered army a conquering army
a finished article the last finishing touch
the spoken word a speaking bird
a closed shop the closing hour
a recorded talk a recording machine
来自不及物动词的过去分词很少能单独用作前置修饰语, 能作这样用的仅限于下面几个词, 仅表示完成意义, 不表示被动意义.
the risen sun, fallen leaves, faded/withered flowers, returned students, retired workers, departed friends, escaped prisoners, the vanished jewels, newly-arrived visitors
用作后置修饰语的过去分词一般都带有修饰语或其他成分, 在意义上相当于关系分句.
Most of the people invited to the reception were old friends.
篇6：大学英语四级语法精要：动词
动词
只能用动名词作宾语的动词: suggest, finish, avoid, stop, can’t help, mind, admit, enjoy, leave off, require, postpone, put off, delay, practise, fancy, excuse, pardon, advise, consider, deny, endure, escape, miss
既可用动名词, 也可用不定式作宾语的动词: love, like, hate, dislike, begin, start, continue, intend, attempt, can’t bear, propose, want, need, remember, forget, regret, neglect, try, deserve, can’t afford等.
有时两种结构之间意义差别不大, 有时却有不同的意思. 在remember, regret, want, try等词后差别是比较明显的.
i remember seeing her once somewhere.
i must remember to take my notebooks with me.
i regret not having accepted your advice.
i regret to say i haven’t given you enough help.
she doesn’t want (need) to come.
the house wants (needs) cleaning.
we must try to get everything done in time.
let’s try doing the work some other way.
悬垂修饰: 分词作状语时, 表示的必须是主语的一个动作或状态.
walking through the park, we saw a lot of flowers. (walking是we的动作, 正确)
walking through the park, the flowers looked very beautiful. (错误)
standing on the tower, we could see the whole city. (正确)
standing on the tower, the whole village could be seen. (错误)
篇7：大学英语四级语法精要：连词
Ⅴ 连词
并列连词
表示意义的引申: and, both…and, not only…but(also), as well as, and …as well, neither…nor
表示选择: or, either…or
表示转折: but, while, whereas, yet, however/nevertheless(也可认为是副词)
表示因果: for, so, therefore, hence
从属连词
表示时间: when, while, as, after, before, since, until(till), as soon as, once
表示原因: because, as, since, now that, seeing that
表示条件: if, unless, in case, provided(that), suppose, as long as, on condition (that),
表示其他关系: (al)though, than, as/so…as, lest, in order that, so…that
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