为什么be made of同一个句子里的动词用的是原形?那个句子明明是应该用一般过去式的啊,难道是因为make的过去式是made?但是be made of不是一个固定搭配嘛?为什么用原型?

为什么be made of同一个句子里的动词用的是原形?那个句子明明是应该用一般过去式的啊,难道是因为make的过去式是made?但是be made of不是一个固定搭配嘛?为什么用原型? Never buy anything made of ivory.这里的be made of 为什么没有加be be made of be made from 分别造两个句子 Your spare time should be made use of为什么加of 这种句子什么时候加of This backpack _____(由.制成）a pair of jeans是BE MADE OF还是BE MADE FROM?并写出这一句的同义句（句子和原先的一样,只是括号里填的词有所不同）BE MADE OF与BE MADE FROM有什么区别? At last they found some coat _____(make)of cotton.为什么横线里填的是made,没有Be动词, be made of 和 be made up of 的区别 be made of的意思 英语be made by、be made into、be made of 、be made in、be made out of 、be made from的区别、、 be made of 、be made from及be made up of的区别 be made of 和be made up of和 be made form 的区别 be made of与be made from的区别 be made of和be made from的区别 The walls are made from old glass bottles that are glued together.The roof is made from discarded tiles.为什么用be made from,怎么不用be made of.be made of不是能看出原材料的那种吗? be made in、be made into、be made for、be made by、be made of、be made from的用法和区别. be made of 和be made from 和be made into的意思与区别? be made into 、 be made from 、be made of的区别 be+made+of,be+made+by和be+made+from的区别