4 sentences

1. 我不是在偷窥。

   wǒ bù​shì zài tōu​kuī.

   I'm not spying.

   Source: OpenSubtitles

2. 有人在偷窥。

   yǒu rén zài tōu​kuī.

   Somebody's peeking.

   Source: OpenSubtitles

3. 他躲在门外，透过门缝偷窥屋里的动静。

   tā duǒ zài mén​wài, tòu​guò mén​fèng tōu​kuī wū​li de dòng​jìng.

   He hid outside the door, peeping at what was happening in the room through a crack in the door.

   Source: Dong Chinese Dictionary

4. 这种偷窥他人隐私的行为不仅不道德，甚至可能违法。

   zhè zhǒng tōu​kuī tā​rén yǐn​sī de xíng​wéi bù​jǐn bù​dào​dé, shèn​zhì kě​néng wéi​fǎ.

   Peeping into others' privacy is not only immoral, but may even be illegal.

   Source: Dong Chinese Dictionary