We learned that the criminal up in prison

Мы узнали, что преступник заключён в тюрьму. 

только я во второй части сказуемого не вижу

Условные предложения I типа.
1. If we (receive) a telegram from him, we (will not worry).
2. If you (do not work) systematically, you (will fail) the exam.
3. If I (live) in London, I (will visit) Big Ben every month.
4. If I (get) a ticket, I (will go) to the theatre.
условные предложения II типа.
1. If we ( received) a telegram from him, we (would not worry).
2. If you (did not work) systematically, you (would fail) the exam.
3. If I (lived) in London, I (would visit) Big Ben every month.
4. If I ( got) a ticket, I (would go) to the theatre.
условные предложения  III типа.
1. If we (had received) a telegram from him, we (would not have worried).
2. If you (had not worked) systematically, you (would have failed) the exam.
3. If I (had lived) in London, I (would have visited) Big Ben every month.
4. If I (had got) a ticket, I (would have gone) to the theatre.

1 If we receive a telegram from him, we won't worry.
If we received a telegram from him, we wouldn't worry.
If we had received a telegram from him, we wouldn't have worried.

2 If you don't work systematically, you will fail the exam.
If you didn't work systematically, you would fail the exam.
If you hadn't worked systematically, you would have failed exam.

3 If I live in London, I will visit Big Ben every month .
If I lived in London, I would visit Big Ben every month.
If I had lived in London, I would have visited Big Ben every month.

4 If I get a ticket, I will go to the theater.

If I got a ticket, I would go to the theater.
I I had got a ticket, I would have gone to the theater.