10: When Katya came, we discussed the news and drank tea.
11: When Katya came, we already discussed the news and drank tea.
12: We had no time to discuss the news as Katya came.
13: When Katya came, she told me that she had heard about this news.
14: What did you discuss when Katya came?
15: What did you discuss when Katya came?
16:Did you discuss something by the time Katya came?
17:Did you already know anything by the time Katya came?