介词用法口诀早、午、晚要用in,at黎明、午夜、点与分.　　年、月、年月、季节、周,阳光、灯、影、衣、冒in.　　将来时

将来时态 in … 以后例:They will come back in 10 days。他们将10天以后回来。I'll come round in a day or two。我一两天就回来。We'll be back in no time。我们一会儿就回来。Come and see me in two days' time。两天后来看我。(从现在开始)After … (从过去开始)小处 at 大处 in例：Li and I arrived at Heishan county safe and sound,all is well。Don't worry。李和我平安地到达黑山县,一切很好,勿念。I live in a great city (big city),my sister lives at a small town while my parents live at a village。我住在大城市,我姐姐住在一个小城镇,而我的父母则住在农村。I'm in Liaoning,at Anshan。我住在辽宁省鞍山市．有形 with 无形 by例：The workers are paving a road with stone。工人们正用石子铺路。(有形)The teacher is correcting the paper with a new pen。这位教师正用一支新笔批改论文。(有形)“Taking Tiger Mountain by Strategy”is a good opera。是—出好戏。(无形)The product is separated by distillation into gasoline and gas oil。这种产品是用蒸馏分离出汽油和粗柴油。(表示方式、手段、方法——无形)“介词 at、to 表方向,攻击、位置、善、恶、分”。介词 at 和 to 都可以表示方向; 用 at 表示方向时,侧重于攻击的目标,往往表示恶意；用to 表示方向时,突出运动的位置或动作的对象,侧重表示善意。试比较下列各句：1。A．She came at me。她向我扑过来。B．She came to me。她向我走过来。2．A．Jake ran at John。杰克向约翰扑过去。B．Jake ran to John。杰克朝约翰跑去。3．A。He rushed at the woman with a sword。他拿着剑向那妇女扑过去。B。He rushed to the woman with a sword。他带着剑向那妇女跑过去。4．A．He shouted at the old man。他大声喝斥那老人。B。He shouted to the old man。他大声向那老人说。5．A．I heard her muttering at Xiao Li。我听见她在抱怨小李。B．I heard her muttering to Xiao Li。我听见她在同小李低声说话。6．A。She talked at you just now。她刚才还说你坏话呢。B．She talked to you just now。她刚才还同你谈话呢。7．A．She threw a bone at the dog。她用一块骨头砸狗。B．She threw a bone to the dog。她把一块骨头扔给狗吃。8．A．He presented a pistol at me。他用手枪对着我。B．He presented a pistol to me。他赠送我一支手枪。