2 sentences

1. 如果现在放弃，岂不是前功尽弃？

   rú​guǒ xiàn​zài fàng​qì, qǐ​bù shì qián​gōng​jìn​qì?

   If we give up now, won't all our previous efforts be in vain?

   Source: Dong Chinese Dictionary

2. 如果我们现在放弃，就会前功尽弃。

   rú​guǒ wǒ​men xiàn​zài fàng​qì, jiù huì qián​gōng​jìn​qì.

   If we give up now, all our previous efforts will go to waste.

   Source: Dong Chinese Dictionary