Which is right?
□ 1. The body of this racing car is made of a new type of lightweight fiberglass.
□ 2. The body of this racing car is made by a new type of lightweight fiberglass.
○1. The body of this racing car is made of a new type of lightweight fiberglass.
2. The body of this racing car is made by a new type of lightweight fiberglass.
made of係指某物製成所用之材料,亦可用made cut of,而made by是被動語態的某物由某人做成,如This cuckoo clock is made by a long craftsman in a small Swiss village.
The preposition "of", after "made" introduces a construction material, such as wood, metal or plastic. We can also say "made out of..." "made by" introduces the maker(s), e.g. "This cuckoo clock is made by a long craftsman in a small Swiss village".