Translation of standstill in Spanish

It would be an advantage if you could send it via DHL, UPS or another Currier, because the parcel was lost once when we sent it with regular mail. Please send me a reference number after you send it.
I have began to learn English. I like to swim and to dive, because I lived near the beach while I lived in Miami. It is not similar to any other sport. But this week have not been yet to the pool.
It's very good that you can learn English with the help of technology (Internet), I think you'll learn quickly. Although I am now getting better, I feel the improvement. But once again I lack vocabulary.