中文摘要：

语气词“得了”的情态义分为两类：一类表弱建议，同时带有无奈意味；另一类表随意。后者是从前者派生而来。表随意的“得了”可以与表随意的“好了”互换，而表弱建议的“得了”与妥善处理的“好了”不能互换。语气词“得了”源于“就得了”的简省，演变环境决定了它情态义的形成。

英文摘要：

The modal meaning of＂De Le＂ has two kinds： the one shows the weak suggestion and is helpless; the other shows the random and is derived from the former. The second ＂De Le＂ can exchange with ＂Hao Le＂. But the first ＂De Le＂ can not exchange with ＂Hao Le＂. ＂De Le＂ is the omission of ＂Jiu De le＂, the environment of evolution determines the formation of its modal meaning.