mandative subjunctive，也就是意志类动词(名词、形容词)的用法，文法假设语气篇会详细介绍。另外，若insist做"坚信"(=firmly believe)时，就不适用这种接原形动词的用法了。虽然大考不再刁钻文法，不过还是来个类似句型的小补帖：It is+形容词:odd/strange/surprising/wonderful或名词:a pity/no wonder/a shame/a surprise+that S +(should)+ 1. 原形动词，或2. have + P.P. <表过去>；这是用来表达主观情绪的句型，should做“居然”之意。例句：I am surprised that such an industrious student as John (should) play truant.像约翰这么用功的学生居然会跷课，真令我惊讶。