When heated or taken into the warm room ice soon changes int

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When heated or taken into the warm room ice soon changes into water.
（为什么在v.-ed作状语的情况下,when不去掉呢?）

When（主+被动词） heated or taken into the warm room ,ice soon changes into water.
【,】前面是从句,when是连词,【,】后面是主句,主从复合句怎么能省略连词
从句里面（）部分才是可以省略的
再问：那为什么 seen under a microscope，a fresh snow flake has a delicate six-pointed shape 这可以把when也省了呢？
再答：其实状语从句（主从句主语不变）都可以改成分词作状语，我现在觉得你原来那句的确可以改成状语从句了，但是时态要发生变化吧。

When heated or taken into the warm room ice soon changes int When a block of ice is taken into a warm room,it becomes___ When ______into a warm room ,the ice is soon changed to wate When a piece of ice is taken ____ a warm room,it gets smalle when____ ,ice changes into water 为什么填heated 而不是be heated 不是被 -----------------,water changes into vapor. a When heated b When____into a warm room,the ice is soon changed to water bring the flowers into a warm room _____ they'll soon open.a 1.When ___ taken___(take) into a dark room,the boy burst int When the temperature________,ice turns into water 将下列句子中的划线部分改为定语从句或状语从句 1.When heated,water changes into stea 你好请问这句话怎样分析,heated ,water changes into steam为什么heated要用过去式?