because the first thing he did was study other system.为何study用原型?
问题描述：
because the first thing he did was study other system.为何study用原型?
答
这句话是没错的.这句话中的study之所以用原型,是省略了前面的"to".前面有仁兄说了要有动词不定式,但在英语语法中,动词不定式（"to+do"）在若干种情况下中的to是可以省略的.比如在这句话中,to study other system作为...