Translate the provided German sentences into Russian and provide explanations.

The sentences provided are written in German with blanks where verb conjugations in past, present, or other forms are required. Each sentence has been filled in with the appropriate conjugation. For example, 'Wir (essen) einen Apfel.' has been filled as 'Wir aßen einen Apfel.' which translates to 'We ate an apple.' in English. Similar translations and explanations can be given for each sentence.