You will be given a definition of a task first, then some input of the task.
In this task, you are given two sentences in the English language (Sentence 1 and Sentence 2). Your task is to identify the connecting word between the two sentences.

Sentence 1:BG constructs an excellent paper bird for a school project . Sentence 2:But when she tries to share her expertise with her best friends , it leads to misunderstandings and hard feelings .
Output:
but