这件事成问题了。
zhè jiàn shì chéng wèntí le 。
This matter has become a problem.
如果你不提前准备，这会成问题。
rúguǒ nǐ bù tíqián zhǔnbèi ， zhè huì chéng wèntí 。
If you don't prepare in advance, this will become a problem.
时间不够可能会成问题。
shíjiān bùgòu kěnéng huì chéng wèntí 。
Not having enough time could become a problem.