suitable用法总结

suitable用法总结（共4篇）

suitable用法总结 篇1

These films are suitable for adults only.这些电影只适宜成人观看。

All the students are assigned to suitable jobs.所有的学生都分到了合适的`工作。

suitable用法总结 篇2

Ⅰ.虚拟语气用在非正式条件句

If we had time, we would go with you.

If it rained/should rain/were to rain tomorrow, what would you do?

If you had come earlier, you might have met him.

(1) 虚拟条件句中be的过去式一般为were:

If I were you, I would accept his offer.

(2) 在正式文件中, 有时可省去if, 而将were, had, should提到主语前:

Had it not been for your help, we would not have achieved so much.

Had she time, she would of course help you.

Were he here, we could ask him.

Should it rain, the crops would be saved.

(3) 含蓄条件句:不使用条件句而是由介词短语 (without…没有…, but for...要不是…) , 连词 (but但是) , 副词 (otherwise否则) 等或上下文来表示某种假设的情况:

But for the storm, we should have arrived earlier.

(4) 错综时间条件句:主句和从句的动作不是发生在同一时间, 其动词形式要根据时间而定。

lf he had listened to me.he would not be in such trouble now.

If we hadn’t got everything ready by now, we should be having a terrible time tomorrow.

Ⅱ.虚拟语气用在表示要求、建议、命令等的名词从句中, 从句谓语用“ (should+) 原形动词”

(1) 用在动词insist, suggest, order, propose, demand, request, command, desire等后面的宾语从句中:

He suggested that we (should) start now.

He insisted that we (should) discuss the matter at the meeting.

The commander ordered that all soldiers (should) take part in the work.

注:1) 在美语中should常省去。

2) 当suggest表示“暗示、表明”, insist所带宾语从句中的动作发生在主句动作之前或一般情况时, 仍用陈述语气。

The expression on his face suggests that he knows it.

He insisted that he had finished the work ahead of time.

He insisted that she was telling the truth.

(2) 用在名词insistence, suggestion, order, proposal, demand等后面的表语从句和同位语从句中:

Their suggestion is that their output (should) be increased by 20%.

What do you think of his suggestion that we (should) put on a play?

(3) 用在“It+be+natural (necessary, strange, importam等, 以及insisted, suggested, ordered等、) +that...”结构中的that引导的主语从句中:

It’s necessary that you should be present at the meeting.

It was suggested that the medicine should be sent there by plane.

Ⅲ.虚拟语气用在wish后面的宾语从句中

wish后面从句中虚拟语气情况的谓语形式:

现在that+主语+过去时

过去that+主语+had+过去分词

将来that+主语+would (或might) +动词原形

I wish I knew the answer. 但愿我知道答案。

注:1) 在It is wished that…以及wish作名词时后面的表语或同谓语从句也要用虚拟语气:

It is wished that he had not made the mistake.他要没犯此错误该多好。

2) if only引起的感叹句, 其形式和意义与wish相同。

If only I had the chancel (=1 wish I had the chancel)

Ⅳ.虚拟语气用于as if (或as though) 引起的方式状语从句或表语从句中, 表示“好像”, 形式和wish宾语从句中的形式相同。

They are talking as if they had been old friends. 他们谈着话好像多年的老朋友。

注:本句型有时用于陈述语气表示较大的真实性:

It looks as if it is going to rain.看来天要下雨。 (真的要下雨)

Ⅴ.虚拟语气用在状语从句中。

(1) 在in case, lest, for fear that引起的状语从句中, 表示“以防”, “以免”, 从句谓语形式常为“should+动词原形”

He took his raincoat with him in case it should rain.他带上了雨衣以防下雨。

I shall ring you up lest you should forget to come.我要打电话提醒你以免你忘了。

I took an umbrella with me for fear that it should rain.我因为怕下雨而带伞去。

注:1) 本句型中should一般不可省去。

2) 本句型有时可不用虚拟语气, 而用一般现在时或一般过去时:

Here’s some money in case you need it.这儿有点钱以防你需要用。

(2) 在so that, in order that 引起的状语从句中, 表示“以便”, “为了”, 从句谓语需用情态动词, 现在时态常用may, can或will;过去时态常用could, should或might, 有时也用would:

I hired a boat so that I could go fishing.我租了一条船, 为的是可以去钓鱼。

They set out early in order that they might arrive in time.他们很早出发以便及时到达。

Ⅵ.虚拟语气用在表示祝愿的句子中

(1) 用动词原形:

Long live the friendship!友谊万岁!

“God bless you, ”the priest said.牧师说:“愿上帝保佑你!”

(2) may+动词原形:

May you be happy!祝你快乐!

Ⅶ.虚拟语气中should+动词原形 (或完成形式) , 还可表示惊奇、惶惑、怀疑、不满等作用

(1) 用在expect, believe, think, suspect等动词的否定或疑问形式后的宾语从句中:

I never expected that the problem should be so complicated.我从来没有想到问题会这样复杂。

They just couldn’t believe that the new stadium should be so big.他们简直不相信新体育场会这样大。

(2) 用在it is a pity, it is a shame, it is incredible, it is strange, it is natural, it is no wonder等结构后面的主语从句中:

It is a great pity that he should be so careless.真遗憾他会这样粗心。

It is strange that she should have failed to see her own shortcomings.真奇怪, 她竟然没有看出自己的缺点。

(3) 用在I am sorry, we were surprised, they were disappointed等结构后面的状语从句中:

I am sorry that he should be in such poor health.我真难过, 他身体这样坏。

We were surprised that she should be so stupid.我们很奇怪, 她怎么会这样蠢。

Ⅷ.虚拟语气的其他用法

(1) 用在It’s time that...结构中, 表示“该干某事了”, 含建议的意思, 从句中用动词过去时:

It’s time (that) we went to bed.

注:前可加about (表示“大约”) 或high (表示强调) 等。

(2) 用在would rather, would as soon, would sooner和would prefer后面的从句中, 表示“希望”, 用动词过去式虚拟当时或将来的情况, 用过去完成式虚拟过去的情况:

I’d rather I had seen the film..我真希望我看过这部电影。

(3) must, may, should等+have+过去分词, 表示“想必已经…”, “可能已经…”, “本该已经…”等意思:

He may (must, can, t) have gone to work.他或许 (一定, 不可能) 去上班了。

You shouldn’t have talked so much.你本不该讲那么多。

定语后置用法总结 篇3

一、表示度量的短语修饰名词时应后置

a river five metres wide

一条五米宽的河

a boy sixteen years old

一个十六岁的男孩

注：当这类词组作定语放在名词前时，表示量的名词应用单数形式，且数词与量词之间应加上连词符号“－”。上述例子可改写为：a five－metre－wide river, a sixteen－year－old boy。

二、介词短语作定语时应后置

The boy in the room is my brother．

屋里的男孩是我弟弟。

He lives in a tall building in the city of Shanghai．

他住在上海的一幢高楼里。

三、副词here，there，home，

downstairs，upstairs，below，above等作

定语时应后置

The boys there are reading English．

那边的男孩正在读英语。

The man downstairs can’t sleep well．

楼下的那个人睡不好。

四、两个以上由并列连词连接的形容词修饰一个名词时，应放在后面

He is a teacher, both kind and strict．

他是一个既和蔼又严格的老师。

They lived in a house, clean and bright．

他们住在一个干净明亮的房子里。

五、形容词短语作定语时要后置

They saw many bags full of apples．

他们看到许多装满苹果的袋子。

There are a lot of things too far away to see in the sky．

天空中有许多太远看不到的东西。

六、形容词修饰不定代词(如

something，nothing，anything，everything，somebody，anyone等)时，要后置

He will tell us something interesting．

他将告诉我们一些有趣的事情。

There is nothing new in the room．

房间里没有什么新东西。

七、分词短语作定语时要后置

The boy called Tom is in Class One．

那个名叫汤姆的男孩在１班。

These girls sitting under the tree are my friends．

那些坐在树下的女孩是我的朋友。

八、enough，last，next，nearby等作定语时，既可放在所修饰的词之前，也可放在后面

He has enough money(money enough) to buy a car．

他有足够的钱买一辆汽车。

We often go fishing in the river nearby(the nearby river)．

我们常去附近的小河钓鱼。

九、else修饰疑问词或不定代词时应后置

What else did he say?

他还说了些什么?

He is taller than anyone else in his class．

他是班里个子最高的。

十、動词不定式作定语时应后置

We have much work to do．

我们有许多活要干。

The best time to come to China is in spring．

来中国的最好时间是春季。

十一、定语从句要后置

He is the man who I am looking for．

他就是我正在找的那个人。

This is the lesson that we should remember．

动词不定式省略to的用法总结 篇4

不定式省to有六种情况：

一、 在主动结构中，下列动词后作宾补的动词不定式应省略to

“五看”（see， watch， notice， observe， look at）“三使”（make， let， have）“两听”（hear， listen to）“一感觉”（feel）半帮助（help）

如：Who made him work all night long？

但是，改为被动结构后，应补出省略的to。

如：He was seen to break the window.

二、would rather， had better，Why…，Why not…后

如：You had better stay at home.

Why not have a good rest on Sunday？

三、介词except / but/other than等后遵循“有do略to，无do 补to”

用作介词except， but宾语的不定式有时带to，有时不带to。其大致原则是：若其前出现了动词 do，其后的不定式通常不带 to；若其前没有出现动词 do，则其后的不定式通常带 to。

如：I had no choice but to wait. 除了等，我没有别的选择。

He wanted nothing but to stay there. 他只想留在那儿。

She can do everything except cook. 除了做饭之外她什么都会。

四、主语带do表语省略to的情况

当主语部分有动词do的某种形式时，用作表语的不定式可以省略to。

如：All you do now is （to） complete the form. 你现在要做的只是把这张表填好。

The only thing to do now is （to） go on. 前进是现在唯一的出路。

What I’ll do is （to） tell her the truth. 我要做的就是告诉她真相。

五、并列不定式省略to的情况

当两个或多个作用相同的不定式并列时，通常只需在第一个不定式前用to，其余不定式前的to可以省略。

如：He told me to stay there and wait for him. 他叫我在那儿等他。

I’m really puzzled what to think or say. 我真不知该怎么想怎么说。

It is easier to persuade people than （to） force them. 说服人容易，强迫人难。

但是，如果两者有对比关系，则后面不定式前的to不可省略。

如：To try and fail is better than not to try at all. 尝试而失败总比不尝试好。

六、省略不定式是否保留to

在一定的上下文中，为了避免重复，有时不定式可以省略，但通常保留不定式符号to。

如：I shall go if I want to. 如果我想去就去。

“Don’t be late.” “I’ll try not to.” “不要来晚了。”“我尽量不来晚。”

Don’t go till I tell you to. 等我叫你走你再走。

注意：1>. 若被省略的不定式为to be短语，则通常应保留to be。

如：He is not the man he used to be. 他已不是原来的那个样子了。

2>. 有时省略不定式时，同时也可省略to。

如：She may go if she likes （to）. 她想去就可以去。