5 sentences

1. 他暗暗观察着周围的动静。

   tā àn'àn guān​chá zhe zhōu​wéi de dòng​jìng.

   He secretly observed the movement in his surroundings.

   Source: Dong Chinese Dictionary

2. 他对比自己大几岁的邻居早已暗暗钟情。

   tā duì bǐ zì​jǐ dà jǐ suì de lín​jū zǎo​yǐ àn'àn zhōng​qíng.

   He has long been secretly in love with his neighbor, who is a few years older than him.

   Source: Dong Chinese Dictionary

3. 他一直暗暗爱慕着那位才华横溢的女子。

   tā yī​zhí àn'àn ài​mù zhe nà wèi cái​huá​héng​yì de nǚ​zǐ.

   He has always secretly admired that talented woman.

   Source: Dong Chinese Dictionary

4. 听了这话，我不由暗暗吃惊。

   tīng le zhè huà, wǒ bù​yóu àn'àn chī​jīng.

   Hearing this, I couldn't help but be secretly surprised.

   Source: Dong Chinese Dictionary

5. 听到他的夸奖，我心里暗暗感到自豪。

   tīng​dào tā de kuā​jiǎng, wǒ xīn​li àn'àn gǎn​dào zì​háo.

   I felt a secret sense of pride upon hearing his praise.

   Source: Dong Chinese Dictionary