核心问题
（1）He caught the ball. （2）He caught at the ball. 请问上面两个句子有无区别？
词典解答
有区别。句(1)是指“他抓住了球”，强调结果，句(2)是指“他去抓球”，强调“去抓”“设法抓住”“试图抓住”这一动作过程，而不管实际上是否抓住，即不涉及结果。
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The cat caught a mouse. 猫捉住一只老鼠。
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Catch the ball with both hands. 用两只手抓住球。
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A drowning man will catch at a straw. 快淹死的人连一根稻草也要去抓的。
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A businessman will catch at any chance of making a profit. 生意人会想方设法抓机会赚钱。
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The children caught at the teacher's skirt. 孩子们去抓老师的裙子。请做下面的英语试题：
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The boy ____ the ball but he couldn't get hold of it. A. seized B. grasped C. caught D. caught at
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They will catch ____ any opportunity to practice English. A. in B. at C. on D. from