1、stone的基本用法：
[不可数](常用作定语或用以构成复合词) 石; 石头; 岩石:
house built of grey stone 用灰色石料砌成的房子【所以应该是The bridge is made of stone.不可数】
a stone walls, buildings, floors, statues, ie made or built of stone 石墙、 石楼、 石板地面、 石雕
What type of stone is this? 这是什麽石头?
[可数]石块; 石子; 碎石:
a pile of stones 一堆石块
a road covered with stones 碎石路
Small stones rolled down the hillside as they ran up. 他们跑上山坡, 同时有些小石子滚了下来. She picked up the stone and threw it into the river. 她捡起那块石头扔进河里了.
2、be made of 用……制成的.“……”指从成品上能看出的原料,制成物没有改变原料的本质.
后面所加名词的单复数视情况而定.
The bridge is made of stone. 石头是一种材料,是不可数的,所以用单数形式.
Dream is made of steps. 梦想是一步步走出来的.这里的步子是可数的,所以用复数形式.
其他参考例句:
People used to test coins that were offered in payment, to see if they rang true or were made of false metal.
过去人们在收到付款时,常常试扔一下硬币,听听其声音是真的,还是由假金属制作的.
The fence was made of posts joined together with wire.
篱笆是以铁丝连接起木桩而构成的.
Light often behaves as if it were made of particles.
光常常表现出好象它是由粒子组成似的.
3、the best way to do sth.
应该是 The best way to go to Shanghai is by plane.
例句：We'll decide on the best way to go on our field trip.我们将决定去实习的最佳方式.