之前看过这个NN的帖子http://forum.chasedream.com/GMAT_SC/thread-235781-1-1.html,但是今天看了08语法笔记有这么一条 所谓夹心修饰也是这个原则。很多人对“夹心修饰”都有过一个误解,认为S, v-ing, V. + O.结构中,v-ing既可以往前修饰S,也可以往后修饰V就是夹心,而实际上夹心并不是“可以往前修饰S,也可以往后修饰V” 。在S, v-ing, V. + O.这样的表达中,v-ing约定俗成只伴随修饰动词,见下例: prep 2-104 The yield per acre of coffee berries varies enormously, because a single tree, depending on its size and on climate and altitude, is able to produce enough berries to make between one and twelve pounds of dried beans a year. 这个句子里depending不能改为dependent,因为depending和dependent的区别在于,前者伴随修饰谓语动词is able to produce,后者则是修饰名词single tree,会造成逻辑上不对 —— “一棵树依靠它的size”