7、构成施为句。如果与hereby连用的不是施为句,句子会显得不自然。如:a. I hereby promise to give you a book. . b. I hereby run a race B可用下列公式检测出施为动词:IN SAYING """""" I WAS…ING…。如:a. In saying“I promise" I was prornis-ing, b. In saying "I run" I was running 因此施为动词和非施为动词组成的句子有区别,施为句的特点是说话