虚拟语气用法
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Even the requirement that biomaterials processed from these materials be nontoxic to host tissue can be met by techniques derived from studying the reactions of tissue cultures to biomaterials or from short-term implants.
看到第一个be是动词原形，下意识就能猜到是should/can/would的省略。通过关键词requirement（主语）进行进一步分析，我们很快发现这个that从句对requirement进行修饰，运用了虚拟语气，这印证了从句中情态动词的省略。由此，可以很快找出主句的谓语can be met，整个句子的结构就很清晰了。
虚拟语气的十大句型
一、虚拟条件句： 条件状语从句是非真实情况，在这种情况下要用虚拟语气。 1．条件从句与现在事实不一致，其句型为： 句型1：If ＋主语＋过去时，主语＋ should (could, would, 或might) ＋动词原形 (1) If I were you, I would study hard. (2) If it rained, I would not be here now. 2．条件从句与过去事实不一致，其句型为： 句型2：If ＋主语＋had＋过去分词，主语＋ should（could, would, 或might）＋ have ＋过去分词 (3) If the doctor had come last night, the boy would have been saved. (4) If I had not studied hard, I would have failed in the exam last term. 3．条件从句与将来事实不一致，其句型为： 句型3：If ＋主语＋过去时/ should ＋动词原形/ were to＋动词原形，主语＋ should (could, would, 或might) ＋动词原形 (5) If it should rain tomorrow, we would stay at home. (6) If I were to go to the moon one day, I could see it with my own eyes. (7) If you missed the film tonight, you would feel sorry.
注意问题： 1．If条件句中绝对不可以出现would。 2．根据句中的时间状语，有时可能出现“混合虚拟”的情况，即主句可能是现在的情况，条件句也许是发生在过去的情况，但都要遵守上述句型。如： (8) If you had studied hard before, you would be a college student now and you would graduate from a college in four years’ time. 3．条件句中如果出现were, had, should可省去if，将主语与这些词倒装。例如： (9) Had the doc.001pp.come last night, the boy would have been saved. (10) Were I to go to the moon one day, I would see 内容过长，仅展示头部和尾部部分文字预览，全文请查看图片预览。 ，had等词移到句首：这就是虚拟条件句的倒装。
例如：
If he had come yesterday，he would have know it.
=Had he come yesterday，he would have known it.
If I were there，I would help them.
=Were I there，I would help them.
If I should have 2000,000 yuan，I would buy a good car.
=Should I have 2000,000 yuan,I would buy a good car.
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