The purpose category possesses three fundamental semantic features: intentionality, the semantic relationship of “Purpose-Action” or “Action- Purpose”, and irrealis. Moreover, these three semantic features can be used as the semantic foundation to establish the purpose category.
In addition, whether a sentence or a construction possesses these three semantic features or not can be regarded as a criteria to tell this sentence or construction reflects the purpose category or not. The findings of this research showed that the purpose conjunctive sentence and the purpose contraction conjunctive sentence, the purpose conjunctive simple sentence which is connected by connectives, the purpose conjunctive serial verb sentence and ‘V + PO’ construction have the function of reflecting the purpose category. Among these members of purpose category, the purpose conjunctive sentence is the most prototypical member, and rest of the members are marginal members.
Therefore, we can regard the connective word such as “wei, weile, weizhe, yi, yibian, yiqi, yiqiu, hao, jieyi, yongyi, lai, yimian, yifang, shengde, miande” and the connective phrase such as “wei(le)……er……, wei(le)……qijian, weideshi, shiweile” as the purposive marker of the Chinese purpose category.