be made of 和 be made from 都表示"由……制成"，区别在于是否看得出原材料。口诀：物质不变用 of，物质变化 from。
顺口溜记忆
- 物质不变用 of，看得出原材料
- 物质变化用 from，看不出原材料
- 如果物质不明白，可问君自何处来
- made in 表产地，made by 表制作者
要点讲解
- be made of：看得出原材料（物理变化）：The desk is made of wood. 桌子是木头做的。
- be made from：看不出原材料（化学变化）：Paper is made from wood. 纸由木头制成。
- be made in + 地点：This watch is made in China. 这块表是中国制造。
- be made by + 人：The model is made by my brother. 这个模型是我哥哥做的。
- be made up of：由……组成：The class is made up of 40 students.
例句解析
- The kite is made of paper. 这个风筝是纸做的。
- Wine is made from grapes. 葡萄酒是由葡萄酿成的。
- These shoes are made in Italy. 这些鞋是意大利制造的。
易错提醒
- from 与 of 的判断标准：能否看得出原材料。木材做成桌子看得出用 of，葡萄酿成酒看不出用 from。