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题库 / Prep2007E2-SC-134
If a drug that is already on the market has the potential to help adults and children who have the same disease, or if it is widely used in children and the absence of labeling seems dangerous, the FDA can require that the drug undergo pediatric study.
that the drug undergo
that the drug undergoes
that the drug is to undergo
the drug undergoing
the drug to have to undergo
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require是典型的强约束力动词啊。。。求讲解。。。
require (that) sb/sth (should) do... ???
是啊，所以“建议，命令，要求”当谓语动词时，要求宾语从句中的动词用原型。原型实际上就是不定式嘛。
可是用了原型不就是变成从句了吗？从句和不定式不是一个概念吧？
还是说这里应该看做是省略了to，所以不跟单三形式，而是接原型？
你自己悟出来的很对。
我以为动词不定式都是to+verb, 也可以省略to直接跟动词原型的嘛？困惑。。。
这里宾从用原型的原因是，命令意义的单词如require作主句谓语时，宾从里省略了情态动词 should，所以后面动词必用原形
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