I would certainly put a comma after one day , but I'm not so sure about after sand . One day, he was playing in the sand when he heard his dog barking from inside.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
SnarfSo it's not a dependent clause?Sorry, I forgot to answer that question. When he heard his dog barking from inside is the dependent clause.