Questions & Answers about Mia kara amiko venis.
Because -is is the Esperanto ending for the past tense.
- veni = to come
- venis = came / has come
So Mia kara amiko venis means that the coming happened in the past.
Yes. The dictionary form is veni (to come). Esperanto verbs change their endings regularly:
- veni = to come
- venas = comes / is coming
- venis = came
- venos = will come
- venus = would come
- venu = come! / let ... come
So in this sentence, veni becomes venis.