The phrase "to emphasize who is responsible for something" doesn't contain a verb in a form that indicates passive or active voice since it is a general statement about an intention or purpose. However, the focus on identifying responsibility suggests an active approach.
In terms of sentence structure:
- Active voice: The subject performs the action (e.g., "The manager emphasized who is responsible for the project").
- Passive voice: The subject receives the action (e.g., "It was emphasized by the manager who is responsible for the project").
If you would like a specific sentence analyzed for voice, please provide it!