1. The problem being discussed (discuss) now has something to do with our work.  

2. The problem discussed(discuss) yesterday has something to do with our work.

3. Nobody knows the topic to be discussed(discuss) tomorrow.  

4. The foreign guests, followed (follow) by a translator, came out of the meeting hall.

5. Did you take part in the activity organized (organize) by our school?

6. In the past, some people used trained (train) monkeys to make money, travelling from one place to another.