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虚拟语气在主语从句中的用法

1、It+be+形容词+主语从句

“It+is+形容词+that引导的主语从句”句型，用动词原形或“should+动词原形”虚拟语气。常用于本句型的形容词有:

necessary,important,impossible等;还有与表示提议、要求、命令等动词同源的形容词词，

如desirable(←desire),urgent(←urge),advisable(←advise),preferable(←prefer)等。

It is necessary that he listen to the radio frequently.

她很有必要常听收音机。

It is strange that he(should)have so many friends.

真奇怪，他居然有这么多的朋友。

2、It+be+过去分词+主语从句

“It+is+过去分词+that引导的主语从句”，可用“(should)+动词原形”。

常用于这一句型的过去分词有：suggested,required,requested,demanded,urged,ordered,proposed,desired,advised,etc.

It is ordered that we(should)go at once.

命令我们立刻出发。

It has been decided that the meeting(should)be put off.

已决定推迟会议。

三、虚拟语气在状语从句中的用法

1、虚拟语气在as if/as though引导的方式状语从句中的用法

虚拟语气用在as if/as though引导的方式状语从句中，谓语动词用过去时(be用were)或"had+过去分词"形式。

When a pencil is partly in a glass of water,it looks as if it were broken.如果把铅笔的部分放在盛水玻璃杯中，铅笔看上去好像断了。

The two strangers talked as if they had been friends for years.

那两个陌生人走在一起，好像是多年的朋友。

It seems as if it were spring already.

现在仿佛已是春天了。

He spoke as though he had known it.

他说起话来，好像他知道了似的。

四、虚拟语气在目的状语从句中的用法

再for fear that,in order that,so that,lest引导的目的状语从句中，谓语动词一般用should(could,might)+动词原形表达虚拟语气，lest引导得从句用should+动词原形,should可以省略。

I obeyed her lest she should be angry.

我得顺着她，免得她生气。

Be careful lest you fall from that tree.

要当心,以免从树上摔下来。

In order that she could catch the train,she hurried through her work.为了赶火车，她匆匆做完了她的工作。

I will not make a noise for fear that I might disturb you.

我不会做声的，以免打扰你。

五、虚拟语气在表语从句和同位语从句的用法

在proposal,suggestion,order,requirement,desire,

decision,advice,plan,necessity

等表示提议、要求、命令等名词的后面的表语从句和同位语从句中，可用“动词原形”或“should+动词原形”虚拟语气。

His suggestion is that the meeting be put off.

他的建议是推迟开会。

He made the suggestion that we go by train.

他建议我们坐火车去。

六、It is time that的虚拟形式

在“It is(high)time+that从句”结构中，用“did型”虚拟语气，意为“到了做某事的时间了”。意思是早该干而已经有些晚了。

在这种情形下常用过去时。

谓语动词的虚拟形式

It is(high/about)time that

动词过去式(be多用were)

It is high time that you caught the bus.

是你该赶车的时候了。

It is(high)time that you went to school.

到了你上学的时间了。

七、比较if only与only if

only if表示“只有”;“if only”则表示"如果……就好了"。If only也可用于陈述语气。

I wake up only if the alarm clock rings.

只有闹钟响了，我才会醒。

If only the alarm clock had rung.

当时闹钟响就好了。

If only he comes early.

但愿他早点回来。

If only I had more money!

要是我有更多的钱就好了!

八、英语中有些惯用语包含着虚拟语气

1、提出请求或邀请

Would you leave a note for her!

你要不要给她留张条子。

I should be grateful,if you would be kind enough to help me.

如果你愿帮我，我将不胜感激。

2、提出建议或劝告

You might as well put the meeting off for a couple of days.

你不妨把会议向后推迟两天。

It would be best if you didn't lend him the money.

你不借给他钱那是较好。

3、表示愿望、祝愿或诅咒

Long live…!万岁……

God bless you!一路平安。(送别时用语)

Oh，If I knew it is only a trap.

啊，我要知道这是陷阱就好了。

虚拟语气在雅思口语当中如果不是轻车熟路的话一定要谨慎使用，另外虚拟语气也能够帮助我们更好的理解雅思阅读，希望同学们学会如何使用虚拟语气，淄博韦博欢迎同学们到来帮助同学攻克在雅思学习道路上的障碍!