Similarities between delhi and sikkim in art and culture essay 500 words​

1) I've been working on this problem for 3 months.
2) We have not received letters from her for several months.
3) Tomorrow father comes late. We'll tidy the apartment and we'll drink tea when he comes.
4) How long have you been waiting for me?
5) Yesterday, I met a friend whom I had not seen for a long time.
6) She's going to read a letter she has just received.
7) When did you see him last?
8) Do not talk to him, he is very busy, he is doing a very important job.
9) He was afraid that something would happen.
10) He has been watching TV since 6 o'clock.
11) What will you be doing tomorrow at 8:00?
12) I'll have done my homework by 6 o'clock tomorrow.
13) We have not had breakfast yet.
14) If I do not help him, he won't write the test well tomorrow.
15) - Have you ever been to Paris?- I'll go to Paris as soon as I solve this promlem.

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.