介词和副词的区别在下面的几个句子中的across哪个是介词,哪个是副词?He suddenly saw Mary across the room.a bridge across the river.We swam across the river.We can't swim across.He couldn't get the idea across to the class.请

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介词和副词的区别在下面的几个句子中的across哪个是介词,哪个是副词?HesuddenlysawMaryacrosstheroom.abridgeacrosstheriver.Weswamacros

介词和副词的区别在下面的几个句子中的across哪个是介词,哪个是副词?He suddenly saw Mary across the room.a bridge across the river.We swam across the river.We can't swim across.He couldn't get the idea across to the class.请
介词和副词的区别
在下面的几个句子中的across哪个是介词,哪个是副词?
He suddenly saw Mary across the room.
a bridge across the river.
We swam across the river.
We can't swim across.
He couldn't get the idea across to the class.
请帮忙分析一下词性,非常感谢!
说一下原因啊,谢谢!

介词和副词的区别在下面的几个句子中的across哪个是介词,哪个是副词?He suddenly saw Mary across the room.a bridge across the river.We swam across the river.We can't swim across.He couldn't get the idea across to the class.请
记住一点,只有介词后面才可跟名词或者代词.
上面的句子从上到下看下来,前三个都跟了名词,所以是介词.
第4个是个病句,游泳穿过什么没有说.
最后一个句子,如果你翻译一下会发现Across在这里的句意跟前面几句的“穿过”不同,这里更应该理解为"扩散",这也就是Across作副词所表达的意思,主要指横向上的扩展.
用地一段提到的规则,"to"后面跟着一个地点,所以是个介词.表示传达到某个地方.
Across如果还是介词,两个介词叠到一起就说不通了.从这一点也可看出Across是个副词.

第一个副词。
2、3介词
最后一个副词