we must save the trees and not buy things made of ivory

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• We shouldn't buy things made of ivory.这里的made是什么用法?
• we must save the trees and not buy things made of ivory.中的“ buy things made of ivory”是一个含实义动词的句子,ok?变否定句需要借助助动词don't,ok?
• 句型：We must save the trees and not buy things made of ivory.
• we must save the trees and not buy things made of ivory
• we must save the trees and not buy things made of ivory意思
• 把下列英语句子改为被动语态,35.we'll put on an English play in our school.36.more and more farmers buy colour TV sets.37.my brother often mends his watch.38.we must water the flowers every day.39.they use knives for cutting things.40.he made the farmers work for a long time.41.did he break the window yesterday?42.they have sold out the light green dresses.43.we clean the classroom every day.44.you must not plant trees in very dry earth.45.you can dig a hole in the
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