一、表示属性、作用或用途
[观察例句]
①There's always plenty to read in the reading room.
②They set up an operating table in a small temple.
[归纳用法]
动词ing形式表示被修饰词的属性、作用或用途时，作“供……用”讲，相当于介词for短语，需置于被修饰词之前。例如the reading room＝the room for reading；an operating table＝a table for operation。
[即学即练1] 补全句子
①He took off his clothes and dived into the swimming pool(游泳池)．
②A sleeping bag(睡袋)is useful when you camp overnight in a field.
