介词（Prepositions）

from, to, with, before, for ... 这些都是介词

prepositions generally come before nouns,

pronouns and gerunds.

介词通常用在 名词、代词、动名词（ing） 之前，一般构成介词短语， 介词+动词原型构成动词不定式，不是介词短语。

介词不能单独存在

介词 + 名词 = 形容词 / 副词

当我要描述 这是一本好书 的时候，只需要一个形容词good就可以完成；

但是当我描述 这是一本关于汽车的书 ，此时，找不到一个形容词可以直接表达 关于汽车的 这个概念，所以这里就需要人为创造了， 用 介词 + 名词 构成一个整体，相当于一个形容词，这样就完成了句意的表达。

副词也是同样的道理：

当我想表达 站在树下 的时候，没办法找到一个副词可以直接表达，所以这里通过用 介词 + 名词 构成一个整体，相当于一个副词。

A preposition can come before a noun ，a noun phrase or a noun clause .

介词可以放在名词、名词短语或名词从句的前面。

A preposition can also come before more than one kind of pronoun.

介词也可以出现在多种代词的前面。

And finally a preposition can be followed by a gerund or a gerund phrase .

最后，介词后面可以跟着动名词或动名词短语。

Prepositions and their objects form prepositional phrases.

We need prepositions to give information about time,location, direction, reasons.

There are different ideas and different relationships that prepositions help us express.

Generally speaking, we`ll find prepositions toward the end of a sentence.

We can start a sentence with a prepositional phrase.

介词及其宾语构成介词短语。

我们需要介词来提供关于时间、地点、方向和原因的信息。

介词有助于表达的不同想法和不同关系。

一般说来，去一个句子的末尾找介词。

我们也可以以介词短语开始句子。

But often we find the prepositional phrases toward the end , after the verb .

但我们常常在动词后面找到介词短语。

for example

Some sentences may have two objects. In that case， you likely have a direct object

and an indirect object.

A direct object is the object of a verb.

The indirect object is the object of a preposition.

有些句子可能有两个宾语。在这种情况下，你可能有直接宾语和间接宾语

直接宾语是动词的宾语

间接宾语是介词的宾语

here's an example:

what if I say：

With this structure :

具有这样的结构：

I'm allowed to separate the preposition and its object and move that pronoun you to an earlier position.

我把介词和宾语分开，把代词 "you" 移到更早的位置。

For now ，just know that in most cases a preposition is directly followed by its object.

But as you saw，there are times when we can separate or need to separate.

就目前而言，只要知道在 大多数情况下介词后面直接跟着宾语 就可以了。

但是正如你所见，有时候我们可以将介词和宾语分开，或者需要将介词和宾语分开.

The object from its preposition.

This happens with the preposition TO.

将宾语与其介词分开

这与介词TO一起发生

For clarity or for emphasis，

We leave the preposition and object together

为了清楚或强调，我们把介词和宾语放在一起

But if I don't need to stress who or what is doing the receiving， I can move the object to an earlier position. After the verb and before the direct object.

但是，如果我 不需要强调 接收者是谁或接收者正做什么，我可以把宾语移到更早的位置。在动词之后和直接宾语之前。

We also see separation of a preposition and its object in questions.

我们还看到介词与其宾语在疑问句中的分离

while we're talking about word order and sentence structure，let me ask you a question.

In this sentence，how many objects do you see？

hopefully， you see two.

你看到几个宾语？希望你看到两个

Is one of them a direct object ？

其中之一是直接的对象吗？

No.

"lobby" and "noon" are objects of prepositions.

we have two prepositional phrases.

不是."lobby" 和 "noon" 是介词的宾语. 我们有两个介词短语 in, at .

When we have a prepositional phrase of place and a prepositional phrase of time, place usually goes before time.

当我们有"地点"的介词短语和"时间"的介词短语时, 地点通常是在时间之前。

Here, out is not a preposition

Your first clue is that there is no object.

Out here is a particle.

The verb look and the particle out form a phrasal verb.

This phrasal verb means be careful.

It serves as a warning.

out不是介词，你的第一个线索是没有宾语, out在这里是一个小品词，动词look和小品词out构成一个短语动词，这个短语动词的意思是小心，作为警告

To study is an infinitive.

TO plus the base form of a verb is the infinitive.

A verb form not a prepositional phrase.

to study 是 不定式 ， TO + 动词原型 是动词不定式，不是介词短语

preposition是什么意思

preposition    英[ˌprepəˈzɪʃn]    美[ˌprɛpəˈzɪʃən]  

n.    介词; 前置词; 

[其他]    复数：prepositions  

[例句]

1

There is nothing in the rules of grammar to suggest that ending a sentence with a preposition is wrong.

语法规则中并没有规定句子以介词结尾是错误的。

2

The word is compounded of a preposition and a verb.

这个词是由一个介词和一个动词复合而成的。

3

You should cancel this preposition in the sentence.

你应该删去句子中的这个介词。

4

The set consists of a verb and at least one preposition.

短语动词由一个动词和至少一个介词组成。

preposition怎么读

preposition

扩展词汇　

英 [ˌprepə'zɪʃn] 　 　

美 [ˌprepə'zɪʃn] 　 　

n. 介词

Preposition is abbreviated as "prep" in this dictionary.

介词在词典中略作 “prep”。

prepositions是什么意思

prepositions

英 [prepə'zɪʃnz] 美 [prepə'zɪʃnz]

n.介词( preposition的名词复数 )

双语例句

1. She lays a lot of emphasis on the usage of prepositions.

她把重点放在介词的使用上.

2. Prepositions and conjunctions are particles.

介词和连词是小品词.

3. Complete the following sentences by filling the blanks with proper prepositions and adverbs.

用适当的冠词和副词填空,完成下列句子.

4. The teacher asked us to fill in the blanks with prepositions.

老师叫我们在空白处填入介词.

5. The words'in ','from','out'and'of are prepositions.

in, from, out,以及of都是介词.