Breakdown of En la excursión éramos diecisiete personas y aun así todo salió bien.
Questions & Answers about En la excursión éramos diecisiete personas y aun así todo salió bien.
Because éramos means we were, so the speaker is including themselves in the group.
- Éramos diecisiete personas = There were seventeen of us / We were seventeen people
- Había diecisiete personas = There were seventeen people in a more impersonal way
Both can be correct in some contexts, but they are not exactly the same.
- Éramos... focuses on the group as "we"
- Había... just states that a number of people existed there
So this sentence uses éramos because the speaker was part of the excursion.
Because éramos is first person plural: we were.
The speaker is talking about a group they belonged to.
- éramos = we were
- eran = they were
So: