was skipping, used to skip
Et si on séchait les cours et qu'on allait à la plage ?
What if we skipped class and went to the beach?
Tom séchait souvent les cours quand il était enfant.
Tom often skipped school when he was a child.
Leon séchait les cours.
Leon was skipping class.
Tom séchait l'école.
Tom was skipping school.