3 sentences

1. 我永远无法报答他。

   wǒ yǒng​yuǎn wú​fǎ bào​dá tā.

   I can never repay him.

   Source: OpenSubtitles

2. 他希望能以优异的成绩来报答父母的养育之恩。

   tā xī​wàng néng yǐ yōu​yì de chéng​jì lái bào​dá fù​mǔ de yǎng​yù zhī ēn.

   He hopes to repay his parents for raising him with excellent grades.

   Source: Dong Chinese Dictionary

3. 为了报答救命之恩，他专门制作了一面锦旗前去致谢。

   wèi​le bào​dá jiù​mìng zhī ēn, tā zhuān​mén zhì​zuò le yī miàn jǐn​qí qián​qù zhì xiè.

   To repay the kindness of saving his life, he specially made a silk banner to express his thanks.

   Source: Dong Chinese Dictionary