be made of与be made from

be made of和be made from都表示“由……制成”,主语为制成品。be made of 表示制成成品后，仍可看出原材料是什么，保留原材料的质和形状,制作过程仅发生物理变化。be made from 表示制成的东西完全失去了原材料的外形或特征,或原材料在制作过程中发生化学变化，在成品中已无法辨认。

例句辨析：
be made of
1、This suit is made of very good material.
这套衣服的质料很好。
2、Some bowls were made of pottery and wood.

一些碗是用陶土和木头制成的。
3、Some of the internal walls of my house are made of plasterboard.
我家房子的一些内墙是石膏板做的。

be made from
1、How many products are made from nylon?
有多少种产品是由尼龙制造的？
2、Made from cast iron, it is finished in graphite enamel.

它是用铸铁制成，最后在外面搪了一层石墨。
3、All sherry is made from wine fortified with brandy.

所有的雪利酒都是在葡萄酒中加入白兰地勾兑成的。

be made of与be made from
1.be made of 表示制成成品后,仍可看出原材料是什么,保留原材料的质和形状,制作过程仅发生物理变化.如：
The kite is made of paper．风筝是用纸做的.
2.be made from 表示制成的东西完全失去了原材料的外形或特征,或原材料在制作过程中发生化学变化,在成品中已无法辨认.如：
The paper is made from wood．纸是木头做的.