1.
1.He studies ancient history in college.
2. He studies the history of Russia at the moment.
3. He taught history yesterday.
4. Yesterday from 6 to 9 pm he taught history.
5. He has been studying history for two years.
6. He just learned the topic of history.
7. Tomorrow he will learn five topics.
8. When I called him, he already learned two topics.
9. When I called him, he taught the story for an hour and a half.
10. Tomorrow by 6 o'clock I will learn all the topics.
11. Tomorrow at 6 o'clock he will teach the history of Greece.
12. By the time my father arrives, I will study history for several hours.