Having Lunch with Professor Marvin Cohen
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Usually, there is a physical lecture in Tuesday afternoon given by profound professors from other universities or other countries. This afternoon, the speaker was professor Marvine Cohen. He was a famous professor at UC Berkeley working on computational physics since 1965. Before the lecture, selected students had a lunch with him. It was fortunate for me to sit next to him on the dining table.
Professor Cohen was very confident and talktive. He gave us a brief introduction about his group at UC Berkeley. He had six students at present, four Ph. D and two Post Doc. He was very friendly to his students. He controlled student's number less than seven since he began his teacher career. If the students had exceeded seven, he did not think he could direct their researches carefully.
He told us a joke in America. After a teacher said "Good morning" in a class, the postgraduate students replied "Good morning". The undergraduate students, however, said nothing and busily wrote "Good morning" in their notebooks.
Professor Cohen was very confident and talktive. He gave us a brief introduction about his group at UC Berkeley. He had six students at present, four Ph. D and two Post Doc. He was very friendly to his students. He controlled student's number less than seven since he began his teacher career. If the students had exceeded seven, he did not think he could direct their researches carefully.
He told us a joke in America. After a teacher said "Good morning" in a class, the postgraduate students replied "Good morning". The undergraduate students, however, said nothing and busily wrote "Good morning" in their notebooks.

Usually, there is a physics lecture in Tuesday afternoon given by profound professors from other universities or other countries.
I think you meant physics here. Physical would mean live/in-person lecture here, unless that's what you wanted to say :)
It was fortunate for me to I was fortunate to be able to sit next to him at the dining table.
Professor Cohen was very confident and talkative.
He controlled student's number less than seven since he began his teacher career. Since he began his teaching career, he has managed seven or fewer students at a time.
If the students had exceeded seven, he did not think he could direct their research carefully.
Usually, there is a Physics lecture on Tuesday afternoon given by great professors from other universities or other countries.
- Physics is capitalized in this case because it is the name of a subject at your school.
- "on" is a better preposition than "in" when talking about times, for example, you would say "on Monday" or "On the weekend I usually clean my room." However, you could say "In the afternoon, I have three classes." So, if you have a day preceding the time of day, you would generally say "on" but if you have just a time word "morning, afternoon, evening, etc" you would use "in." It's a hard rule to understand, but it would sound very strange to use the wrong word.
- The word "profound" tends to describe ideas or objects. You can have a profound discovery or a profound invention, but it is not often used to describe people. It isn't wrong, but not very common.
- The second "other" is too repetitive. Not necessary.
This afternoon, the speaker was professor Marvine Cohen, a famous professor at UC Berkeley working on Computational Physics since 1965.
I merged this sentence with the next one, since your next sentence only serves to further describe Marvine Cohen. This sounds much more fluid and less choppy.
He was a famous professor at UC Berkeley working on computational physics since 1965.
Before the lecture, selected students had a lunch with him, and I was fortunate enough to sit next to him.
Again, merging these sentences keeps things more fluid. You also don't need to mention that you were sitting at a dining table since you were eating lunch. It is assumed you were at a table, so if you were sitting somewhere unusual you should further explain, but in this case you can keep it simple.
It was fortunate for me to sit next to him on the dining table.
He had six students - four Ph.
Saying "at present" confuses the reader about which tense the story is being told.
He told us a joke:
Based on your story, I don't understand the context of this sentence. Why do you feel the need to include "America"?