The chair is too dirty to sit on.为什么要加on呢?不及物动词在什么时候需要加介词

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The chair is too dirty to sit on.为什么要加on呢?不及物动词在什么时候需要加介词
The chair is too dirty to sit on.为什么要加on呢?
不及物动词在什么时候需要加介词

The chair is too dirty to sit on.为什么要加on呢?不及物动词在什么时候需要加介词
及物和不及物的区别就是在于动词后跟宾语,及物可以直接加宾语,如：read a book,但不及物就不能直接加宾语,需要加介词来承接,如：arrive in beijing.
其实你上面这句是被动语态,如果是主动语态则是：to sit on the chair is too dirty.这个你应该知道sit 后面要有"on"
也就是说不及物动词不管是在主动语态还是变成被动语态都要保持有介词.
因为这两种语态是可以相互转换的,在你从被动语态转换过来的时候不能把词给丢了,如过没有这个on,转换过来就是to sit the chair is too dirty.这样是不通的,可以理解了吗?

因sit是不及物动词，也就是后面没有宾语，因此要加介词。
还比如live后要加in等也是同理

sit是不及物动词，就是说动词后面不能直接加上宾语，还有你想想,平时不都是说sit on the chair的吗，就是这个道理。只不过这是换了一个句式来表达。

不及物动词接名词时

因为sit是不及物动词,坐在椅子上:sit on the chair而不能说sit the chair.

不及物动词带宾语都得加介词
你从字面意思上看，不及物就是不够到物品
这句话意思是这凳子太脏了而不能坐
坐sit的宾语是凳子chair，所以中间要加on

因为他的主语是the chair,又因为sit为不及物动词所以其后接宾语是要加介词。坐在椅子上就是sit on/in chair,当然in和on的选择要看椅子的类型。
eg:Who are you waiting for?
不及物动词后接宾语时要加介词

因为椅子是用来被坐的，是人sit on the chair, 再比如 I want a pen to write with. I need a room to live in. 都是这种用法。
不及物动词后跟宾语或地点状语就要加介词。比方wait for a bus, live in the hotel, stop at the corner,look at the picture

有宾语的时候加介词，如listen to music ,look at me 等

接宾语是需要加介词
这句是 sit on the chair 其中 to sit on 做了后置定语

因为sit是不及物动词

后面的on可以加也可以不加，两者意思略有不同。前者有坐上去的意思，后者只是“这只椅子太脏了，不能做。”

句子还原为，To sit on the chair is too dirty。正因为是不及物动词，因此要加介词。有动作要施加的对象时加介词，如chair被sit on。

The chair is too heavy for the little boy to carry 改复合句The chair is . There is no s_____for another chair in the meething room .Because it's too small. the chair is( )the desk. 填空 It is ( ) ( ) the chair The chair is not comfortable enough.B:Yes,I agree.It is ( )A.comfortableB.too uncomfortableC.enough comfortable It is on the chair 对on the chair提问 There is no space for another chair in the meething room .Because it's too small.意思 The chair is too dirty to sit on.为什么要加on呢?不及物动词在什么时候需要加介词 Sit on your chair!Now the chair is ______ you. this chair is too hard 改为一般疑问句 is the ball?Itis under the chair The bag is on the chair. The chair is in the ciassroom. the chair is _ _the sofa 翻译 A bookcase is behind the chair. There is a cat under the chair. the boy is sitting on a chair Tommy’s book is on the chair.