4.动名词作定语

动名词放在所修饰的名词前作定语，表示该名词的用途或有关的动作。

sleeping car卧车(相当于a car for sleeping)

walking stick手杖(相当于a stick for walking)

printing shop印务馆

reading room阅读室

swimming pool泳池

washing machine洗衣机

dining room饭厅

building material建筑材料

有些动名词作定语，与所修饰的名词关系比较复杂。

boiling point=a temperature point at which something begins to boil沸点

a walking tractor=a tractor which a driver can operate while he or she is walking behind it手扶拖拉机

提示：

下面的名词词组中的-ing形式是现在分词。

a sleeping boy一个熟睡的男孩(相当于a boy that is sleeping)

building workers建筑工人(相当于workers who build)

swimming players游泳队员(相当于players who swim)