这个句子中系动词为什么变成be了It is crucial that those new plants be environmentaly sound.SORRY,全句是If we are ever going to protect the atmosphere,it is crucial that those new plants be environmentally sound.(在这里plants 不是植物,是工厂的意思)

问题描述:

这个句子中系动词为什么变成be了
It is crucial that those new plants be environmentaly sound.
SORRY,全句是If we are ever going to protect the atmosphere,it is crucial that those new plants be environmentally sound.(在这里plants 不是植物,是工厂的意思)

是不是表将来啊

因为从句省略了should。
这句话的意思是:那些新的植物应该对环境有利,这是十分关键的。

在It is important/necessary/essential/crucial 等+that 结构中,that 从句里用(should)do .