2 sentences

1. 你为什么总是这么偷偷摸摸地来？

   nǐ wèi​shén​me zǒng​shì zhè​me tōu​tōu​mō​mō de lái?

   Why do you always come so stealthily?

   Source: OpenSubtitles

2. 他如果晚上偷偷摸摸进来我怎么知道啊？

   tā rú​guǒ wǎn​shang tōu​tōu​mō​mō jìn lai wǒ zěn​me zhī​dao a?

   How would I know if he sneaked in here at night?

   Source: OpenSubtitles