2 sentences

1. 他们两个从小到大都形影不离。

   tā​men liǎng gè cóng xiǎo dào dà dōu xíng​yǐng​bù​lí.

   The two of them have been inseparable since childhood.

   Source: Dong Chinese Dictionary

2. 他们正处于热恋中，每天都形影不离。

   tā​men zhèng chǔ​yú rè​liàn zhōng, měi tiān dōu xíng​yǐng​bù​lí.

   They are deeply in love and are inseparable every day.

   Source: Dong Chinese Dictionary