1、表示地点的in和at的区别:一般小地方用at,大地方用in。 例如:He arrived in Beijing on Wednesday. He arrived at the village towards evening. 2、in和on表示时间的区别:in 表示一段时间,on表示具体时间。 例如:He usually goes to school in the morning. He usually stays at home on Sunday morning . 3、in和on在方位名词前的区别:in表示在某范围之内,on表示“相邻”、“接壤”。 例如:Fujian lies in the south of China. Mongolia is (lies) on north of China. 涉及些别的! 懂了吗? o(∩_∩)o...