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1. at ［误］It will really do you no harm quite. ［正］It will really do you no harm at all. ［析］at all和quite的汉语意思均为全然、确定的，但at all适用于否定句，例如：--- Im sorry. Im late.--- No trouble at all. 又如：I dont think it is right at all. 而quite则适用于肯定句，例如：He is quite a good teacher. ［误］The children play football for lunch. ［正］The children play football at lunch. ［析］英语中的at lunch为在吃午饭时。这种惯用法还有at work（在工作），at table（在吃饭），at desk（在学习）。而for lunch则是为午饭而准备的食物，又如：We had some milk for breakfast. ［误］There is a post office in the corner of the street. ［正］There is a post office at the corner of the street. ［析］at the corner是指墙外面的角，而in the corner是指建筑物内部的角落。例如：There is a computer in the corner of the room. There is a street lamp at the corner of the street. at, in, on 在表示时间时用来表示具体钟点用at，如：He will be back at six. 表示一天的上、下午时要用in，如：I usually get up at six in the morning. 但要注意的是：in the morning和in the afternoon这两个词组中如果加入了任何修饰词，其介词要换为on，如：on the cold morning, on the hot afternoon.又如：See you on Monday morning. 如讲到具体的某一天，要用on, 如：on Sunday, 如：I usually want to visit my mother on Sundays. 在谈到周、月、季、年时要用in，如：All the children will be happy in Easter week. He was born in July. 但要注意在泛指圣诞节、复活节、感恩节时都用at, 如：Where are you going at Easter. | 
