be made of与be made from有什么区别

1、be made of“由…构成”，能看出原材料，像桌子由木头制成，刀子由铁或金属制成，很明显看出原材料，如：
①The desk is made of wood.
②The knife is made of metal.
2、be made from“由…构成、制成成品”，被制成的东西看不出原材料，像纸是由木头制成的，这就看不出。
如：The paper is made from the wood.
3、be used for doing 用来做…
如：The knife is used for cutting things.
The pen is used for writing.
4、be used as 用来作…
The house is used as my bedroom.这个房子用作我的卧室。

1.都是由什么组成
be made of 是可以看出原材料的,例:The sweater was made of woollen.
毛衣是羊毛作的(可以看出的)
be made from是不可以看出原材料的,例/:The paper is made from wood
纸是树木作的(看不出来的)
2.be made in 只是说在哪里哪里生产的
比如中国制造,Made in China

of就是做的东西一眼能看出来是什么做的，from则不能，你可以根据物理化学变化来分辨，of是物理变化，from就是化学变化。

be made of 强调的是某一物体就直观上仍可看出原材料是什么，变化过程仅仅是物理变化；
be made from 强调的是某一物体从直观上已完全无法判断原材料为何物，在转换过程中发生了化学变化。

简而言之，be made of 看得出原材料，而be made from 看不出原材料，此为根本。