1) At first people were calm but then they started panicking. (use of "but" to contrast two ideas)
2) I can't attend the meeting; however, I will send my notes instead. (use of "however" as a transition)
3) She studies every day, nevertheless, her grades are still low. (use of "nevertheless" to show contrast)
4) He apologized for his mistake; in addition, he offered to help fix it. (use of "in addition" to add more information)
5) The weather was nice; furthermore, we had a great time at the beach. (use of "furthermore" to add more information)
6) I have not finished my work yet; moreover, I haven't even started. (use of "moreover" to add more information)