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they can form different shapes. 等于Different shapes can _____

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they can form different shapes. 等于Different shapes can _____ _____by them. 这两个空填什么?
在线等.谢谢
they can form different shapes. 等于Different shapes can _____
e formed
再问: en
再答: 这里用的是被动语态 比如I did my homework 换成被动语态就是homework作主语 The homework is done by me. 被动语态的基本结构是 be + 动词的过去分词 在can等情态动词后面通常接的动词都是原形, 所以这里就直接用be formed