Question

explain every part of past tense with an example​

Answer 1

Explanation:

MODAL VERB + HAVE + PAST PARTICIPLE! I had been working in the same school for twenty years when I retired. You had been working in the same school for twenty years when you retired. He/She had been working in the same school for twenty years when he/she retired.

Answer 2

you can see, there are several different past forms used in the above paragraph. To be exact, there are four: Past Simple, Past Continuous, Past Perfect and Past Perfect Continuous.