It is very wasteful / It is a waste to throw away all the metal and paper .
The metal and paper thrown away is very wasteful.(把金属和纸扔掉是非常浪费的)
你丢掉的那本书是书在这里。 The book 主语that you throw away 定语从句修饰 bookis 系动词 here.表语
it is so waste to lost many food
It is a big waste to throw away the mentals and paper.
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Lydia胖胖
