Answer:
Yes, the questions and answers are correct.
Explanation:
1. Both question and answer are using the Past Continuous tense properly. They ask and answer about what the person was doing at a certain time in the past, referring to an action the started and continued for some time, but that also ended in the past.
2. Both question and answer are using the Simple Past tense properly. The Simple Past is used to refer to an action that ended in the past. We must know the specific time (yesterday, last month, last week, etc.) in order to use this tense, even if it is omitted for some reason.
3. and 4. Questions and answers are using the Past Perfect and the Simple Past properly. The Past Perfect indicates an action that happened in the past before another action that also happened in the past. The latter should be indicated by the Simple Past.
