By vs. Of

It is thought that the pyramids of Egypt were built __ slaves and made __ with stone.

a. of
b. by
c. about
e. for
f. from

The answers are b., ‘by‘ and a., ‘of’.


Things are made by people and of materials; so, pictures painted by Da Vinci were made of canvas, paint and oil. A house is built by a construction team is constructed of wood, cement, brick and mortar and tiles–or whatever. Many products are made of plastic by machines.

Author: sayinsei

英語の発音矯正と会話クラスを提供する新宿の語学学校. A language school in Shinjuku offering English classes

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