3 sentences

1. 你手伸到门下，我丢到你手上。

   nǐ shǒu shēn dào mén​xià, wǒ diū dào nǐ shǒu shàng.

   Reach under the door and I'll drop it in your hand.

   Source: OpenSubtitles

2. 他希望能拜入名师门下学习书法。

   tā xī​wàng néng bài​rù míng​shī mén​xià xué​xí shū​fǎ.

   He hopes to study calligraphy under a famous master.

   Source: Dong Chinese Dictionary

3. 他千里迢迢来到京城，想要投在名师门下。

   tā qiān​lǐ​tiáo​tiáo lái​dào jīng​chéng, xiǎng​yào tóu zài míng​shī mén​xià.

   He traveled a long way to the capital, wanting to study under a famous master.

   Source: Dong Chinese Dictionary