3 sentences

1. 不要因为糟糕的一天而气馁。

   bù​yào yīn​wèi zāo​gāo de yī​tiān ér qì​něi.

   Don’t be discouraged by a bad day.

   Source: CCMatrix

2. 我感到气馁，以为我无法克服这些困难。

   wǒ gǎn dào qì​něi, yǐ​wéi wǒ wú​fǎ kè​fú zhè​xiē kùn​nan.

   I felt discouraged and thought that I would not be able to overcome these difficulties.

   Source: CCMatrix

3. 我变得气馁，但我知道我必须保持积极。

   wǒ biàn​de qì​něi, dàn wǒ zhī​dao wǒ bì​xū bǎo​chí jī​jí.

   I became discouraged, but I knew I had to stay positive.

   Source: CCMatrix