4 sentences

1. 一个黑影从窗前晃过。

   yī gè hēi​yǐng cóng chuāng qián huǎng guò.

   A dark shadow flashed past the window.

   Source: Dong Chinese Dictionary

2. 那个黑影在林间一瞥而过。

   nà gè hēi​yǐng zài lín jiān yī piē ér guò.

   The dark shadow flickered through the forest in a fleeting glimpse.

   Source: Dong Chinese Dictionary

3. 刚才窗外好像有个黑影闪过，你看见了吗？

   gāng​cái chuāng wài hǎo​xiàng yǒu gè hēi​yǐng shǎn​guò, nǐ kàn​jiàn le ma?

   A dark shadow seemed to flash past the window just now; did you see it?

   Source: Dong Chinese Dictionary

4. 他因为高烧不退而产生了幻觉，看到墙上有黑影在晃动。

   tā yīn​wèi gāo​shāo bù tuì ér chǎn​shēng le huàn​jué, kàn​dào qiáng shàng yǒu hēi​yǐng zài huàng​dòng.

   He hallucinated due to a persistent high fever, seeing dark shadows moving on the wall.

   Source: Dong Chinese Dictionary