Определить залог и время сказуемого. правильно сделал?

1. Sometimes the weather in England changes very quickly. (Present Simple active.)
2. This article is often reffered to. (Present Simple passive).
3. What are you doing here? — I'm waiting for my friend. (Present Continuous active).
4. He has not been seen for a long time.( Present Perfect passive)
5. I have already done my work. (Present Perfect active).
6. They spent their holidays in the mountains when they were students. (Past Simple active).
7. When you rang me up I was having dinner. (Past simple active, Past
Simple active)
1. They will listen to music from 7 to 8 tomorrow. (Future Simple active).
2. A lot was written about him in the newspapers. (Past Simple passive).
3. When did she come home? — She came at eight. (Past Simple active).
4. Join us. We are discussing a new film. .( Present Continuous active)
5. The plan was discussed two days ago. (Past Simple passive).