祈使句的实质是“我、你”构成一个主体共同体,其中一方是首级主体,是指令者,物理行为的最终决定者,另一方是次级主体,物理行为的直接执行者。“让我VP”是一种执行者为话主本人的祈使句,基本功能是请受话容许自己采取某种行为,并发展出主动承担、引进自我、话语标记等其他功能。祈使句具有强对话特征,因而形成一些独特的语法现象。 The essence of the imperative sentence is “I, you ” constitute a subjective community, one of which is the leader, the command, the ultimate determinant of the physical act, and the other subordinate, the direct performer of the physical act. “Let me VP ” is a kind of imperative sentence of the executor who speaks himself. The basic function is to allow himself / herself to take some action and develop other functions such as taking on himself, introducing himself, discourse markers and so on. Imperative sentences have the characteristics of strong dialogue, thus forming some unique grammar phenomenon.