 The simple past is formed with the past stem and personal endings.The present imperfect is formed by prefixing ме- to the present stem with personal endings

The past imperfect is formed by prefixing ме- to the simple past

The present perfect is formed by adding the personal suffixes to the past participle.The pluperfect is a compound tense formed from the past participle and the simple perfect of the verb будан (to be)

The progressives are compound tenses.