en distintas ocasiones

= at different times, at various times, on several occasions

Ex. At different times Ms. Hinton has used revision, redraft, rewrite, new edition, revised edition, and second edition.

Ex. At various times the library holds computer classes for children and adults.

Ex. On several occasions he was witness to the sights and sounds of Balzac's emotionalism, including tantrum-pitched screaming, banging fists on desks, and slamming doors.

* * *

= at different times, at various times, on several occasions

Ex: At different times Ms. Hinton has used revision, redraft, rewrite, new edition, revised edition, and second edition.

Ex: At various times the library holds computer classes for children and adults.

Ex: On several occasions he was witness to the sights and sounds of Balzac's emotionalism, including tantrum-pitched screaming, banging fists on desks, and slamming doors.