2 sentences for 成问题 (chéng​wèn​tí)

1. 他的这种说法很成问题。

   tā de zhè zhǒng shuō​fa hěn chéng​wèn​tí.

   This claim of his is quite problematic.

   Source: Dong Chinese Dictionary

2. 如果缺了这笔钱，完成计划就成问题了。

   rú​guǒ quē le zhè bǐ qián, wán​chéng jì​huà jiù chéng​wèn​tí le.

   If this money is missing, completing the plan will become a problem.

   Source: Dong Chinese Dictionary