it is crucial that those new plants be environmentally sound.主句中为什么动词用了原形?If we are ever going to protect the atmosphere, it is crucial that those new plants be environmentally sound.

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itiscrucialthatthosenewplantsbeenvironmentallysound.主句中为什么动词用了原形?Ifweareevergoingtoprotecttheatmosph

it is crucial that those new plants be environmentally sound.主句中为什么动词用了原形?If we are ever going to protect the atmosphere, it is crucial that those new plants be environmentally sound.
it is crucial that those new plants be environmentally sound.主句中为什么动词用了原形?
If we are ever going to protect the atmosphere, it is crucial that those new plants be environmentally sound.

it is crucial that those new plants be environmentally sound.主句中为什么动词用了原形?If we are ever going to protect the atmosphere, it is crucial that those new plants be environmentally sound.
这是一个典型的虚拟语气.当句子中有crucial,important,necessary等形容词做表语时,后面that引导的主语从句要用虚拟语气,形式是（should）+动词原型,should可以省略掉.

省略了should，虚拟语气

当it作形式主语，后面用形容词作表语，即在it is + adj.这样的句型中，当描述主语的表语形容词是advisable, critical，crucial, desirable, essential, imperative, important, incredible, inevitable, necessary, recommend, strange, urgent等形容词时，主语从句的谓语...

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当it作形式主语，后面用形容词作表语，即在it is + adj.这样的句型中，当描述主语的表语形容词是advisable, critical，crucial, desirable, essential, imperative, important, incredible, inevitable, necessary, recommend, strange, urgent等形容词时，主语从句的谓语动词多用虚拟语气，如果是现在时，谓语动词用should/would +动词原形(should/would经常省略)；如果是过去时，则用should/would + have done的形式。

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