it was essential that the application forms be send back bef

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it was essential that the application forms be send back before the deadline.
麻烦我想问下这地方为什么不能用would be sent一定要用should

跟什么从句没有关系,要看句字意思来理解.
should 建议,应该.（You should go to school.事实上你没去上学,你应当去上学）常用于称述句.
would,尽管也是委婉的表达,但是表达征求意见,而不是建议,或要求.(would you go to school?,你愿意去上学吗?）常用于征求意见.
按原文意思的理解,assential,是必要,不可缺少的,最重要的,并不是征求意见.
还要可以再问.
再问：请问那我怎么判断一个句子的虚拟语气呢？例如:Doctor suggested that textbooks and notelbooks be printed on my yellow paper, which would be better for eyes看不出虚拟语气
再答：虚拟语气，有一点，动作在说话时，还未发生，将来可能发生或不发生都有可有。在追问的题中，which would be better for eyes,就是在征求对方意见，哪种方法更好一点。

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