He said that it would be possible to build a platform in the center of the channelHe said that it would be possible to build a platform in the center of the channel他说可以在隧道中间建造一座平台这是新概念2册64课文请问句子为什么要加it,为什么?
问题描述：
He said that it would be possible to build a platform in the center of the channel
He said that it would be possible to build a platform in the center of the channel
他说可以在隧道中间建造一座平台
这是新概念2册64课文请问句子为什么要加it,为什么?
答
这里的it应该是做形式主语的。
答
that引导的是宾语从句，是个句子
it则是从句中的逻辑主语
答
it 是代表不动式: to build a platform in the center of the channel
这是一个句型.