わたし　は　よく　おんがく　を　ききながら　さんぽ　を　します。

I often take a walk while listening to music.

あるきながら　スマホ　を　いじってはいけません。

You must not play with the smart phone while you are walking.

ごはん　を　たべながら　スマホ　を　いじるのは　よくないです。

It is bad to play with a smart phone while you are eating a meal.

References:

Te-forms

https://anchor.fm/yuya-sato/episodes/Te-forms-enfaqj

The Expressions of Te-forms

https://anchor.fm/yuya-sato/episodes/The-Expressions-of-Te-forms-engt2g

Changing a verb into a noun describing an action

https://anchor.fm/yuya-sato/episodes/Changing-a-verb-into-a-noun-describing-an-action-env5hs

Instagram:

https://www.instagram.com/yuyaman1986