at
at on in表状态有什么区别？
on in表状态有什么区别？
答：表状态的介词in, 此时表示某事正在进行之中的。例如： The house is in repair. The house is beingrepaired now.
表示状态的介词on, 表示某人正处于某种状态，或者某事正在进行中。例如： He is on holiday. ( He is having/ taking a holiday now. )
介词at 表示某人/某物正处于某种的状态中。例如： He is at rest in the bed. ( He is having a rest in the bed. )
in on at地点国家的用法及区别？
.on,in,at表示地点方位的区别：
①在表示地点时,指“在……之上（与表面接触）” “靠近、接壤”及“在左右边”都用on.
例 ：
There is an English-Chinese dictionary and two grammar books on the big desk．那张大写字台上有一本英汉词典和两本语法书.
Korea lies on the northeast of China． 朝鲜位于中国东北方.
Tom was sitting on my left when we saw the film yesterday． 我们昨天看电影时,汤姆坐在我左边.
②表示“在……里面”（即物体内部）,“在……中间”（即middle前）都用in.
例 ：
Jim turned the key in the lock and opened the door． 吉姆把钥匙插在锁孔里,转动一下,打开了门.
Soon they were in the middle of the river． 很快他们就游到了河中间.
③ at表示一个较小的地点,如在“入口”（entrance）“车站”（bus stop,railway station）和“影剧院”（cinema,theater）等名词前.
例 ：
As she walked along,she noticed an old pine tree ahead at the entrance to a valley． 她往前走时,注意到前边峡谷口有棵老松树.