I wanted to known, what are the options I have to define the concurrent events in the past. For this purpose let's consider a context, A person first came down by the stairs and then talked to me. And the whole incident took place some days ago. Now from the bellow lines what are the right and define reason for those which are the wrong:
- a.1) He came down by the stairs and talked to me.
- a.2) He had come down by the stairs and talked to me.
- a.3) He has come down by the stairs and talked to me.
Another thing is the past perfect:
- b.1) The train had left before I reached the station.
- b.2) The train left before I reached the station.
If I am not wrong then (b.1) is right and (b.2) is wrong. But by that logic (a.1) also represents the sequential events in past but it is right where (b.2) is wrong.