'ОТВЕЧАТЬ' (Imperfective aspect) // 'ОТВЕТИТЬ' (Perfective aspect) - to answer - отвечать на вопросы, - to reply – отвечать на запрос, - to respond – отвечать на вызов.

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)))