Contrary to active and passive construction, middle construction is the expression of the quality of the event, involving three parts: a noun, a verb and a modifier, with the modifier as its center.

• 首先确定了中动结构的实质为与主、被动结构相对的表示事件性质的一类结构，主要包含名词、动词及修饰语三部分，中心是修饰语。