Past Simple:
I walked with my friends yesterday
Past continuous:
He was listening a music, while I was watching TV
Past Perfect:
I hadn't eaten cake before guests came
Past Perfect Continuous:
I had been working there for 10 years before I fired
Past Simple:
I walked with my friends yesterday
Past continuous:
He was listening a music, while I was watching TV
Past Perfect:
I hadn't eaten cake before guests came
Past Perfect Continuous:
I had been working there for 10 years before I fired