'ОПАЗДЫВАТЬ' (Imperfective aspect) // 'ОПОЗДАТЬ' (Perfective aspect) - to be/come late - опаздывать на встречу, - to keep bad time – опаздывать, не быть пунктуальным.

Imperfective verbs have Present, Past and Future tenses. Perfective verbs have Past and Future tenses, no Present tense.

In the first comment you can find PDF-file with all the forms in the sentences. You can download this file for free)))