1. I am not sure if the article gives any answers to such questions.
2. Can you tell me how many points are going to be presented.
3. I am not sure who presented these remarks earlier.
4. I can't really understand why they wrote their objections.
5. I am not sure what it means.
6. I will try to explain what the differences are between the (or these) two systems.
7. Not many people realize what it is like.
8. I am going to illustrate how it changed in Eastern Europe in the 20th century.