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
控制力强的动词包括但不仅限于:make,cause,force,order,allow,require,ask(要求)等等。
控制力弱的动词包括但不仅限于:indicate,know,explain,show,reveal,think,ask(询问)等等。
require是约束力强的动词
require sb to do sth
require that sb should do sth. should情态动词可以省略,谓语原型相当于不定式
Also, in general, "require X to do Y" is only used when X is a person.
mark
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ask beg intend order urge require这些既可以加to do又可以that sb (should) do sth
控制力强的动词包括但不仅限于:make,cause,force,order,allow,require,ask(要求)等等。
控制力弱的动词包括但不仅限于:indicate,know,explain,show,reveal,think,ask(询问)等等。
require是约束力强的动词
require sb to do sth
require that sb should do sth. should情态动词可以省略,谓语原型相当于不定式
Also, in general, "require X to do Y" is only used when X is a person.
命令语气的动词:
要么是 V that do sth, 只能用动词原型+不能再有情态动词等表命令语气的动词,要么是V sb to do sth
除forbid用to do外,其他表禁止的命令语气的动词一律用 v from doing sth
require是约束力强的动词
require sb to do sth
require that sb should do sth. should情态动词可以省略,谓语原型相当于不定式!!!!!
require sb to do sth 要求某人做某事;
require that + 从句 需要,要求,谓语动词用“should +动词原形”,should可省略。
Also, in general, "require X to do Y" is only used when X is a person.
固定搭配。。。。。
require和have to语义上重复
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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