Открывать (Imperfective aspect) // Открыть (Perfective aspect)
to open,
to discover,
to unlock,
to start,
to set up.
Imperfective verbs have Present, Past and Future tenses.
Perfective verbs have Past and Future tenses.
PDF-file with all the forms in the sentences is available here - www.patreon.com/rulangclub/ and https://boosty.to/rulangclub.