Business English How is it going with your Chicago branch? How many converters are they collecting per a month? How many converters do they collect per a month? (what's the difference between above two sentences?) What time will you off today?

First Hey guys! I am a Korean, working for refining company in Korea. I am in charge of overseas business. I arrange to purchase the raw material form US, China, Japan etc. Actually I have only studied english 5 months. So I feel the limit of my English. I hope I can speak English fluently via this web site. Thank you in advance.