副词“不用”与“不禁”由跨层结构“不用”与“不禁”语法化而来,在后接宾语VP的推动下,源构式“不用VP”和“不禁VP”发生了语法化,由双核语法化为单核,在其带动下,“不用”与“不禁”语法化为副词。跨层结构“不用”与“不禁”语法化的动因是源构式的语法化。 Adverbs “not ” and “can not but ” by the cross-layer structure “without ” and “can not help ” from the grammaticalization, driven by the subsequent object VP, the source structure “without VP ” And “can not help but VP ” has been grammaticalized by the dual-core grammar into a single core, in its lead, “without ” and “can not but ” grammer into adverbs. The motivation for the grammaticalization of cross-layer structure “without ” and “can not help but ” is the grammaticalization of the source structure.