Identify the Lewis base in this balanced equation:

B is bonded to F above, below left, and below right. The F's have pairs of electron dots on the 3 sides that do not have bonds. Plus. A central N has two electron dots to the left and is bonded to H above, below, and to the right. right arrow. B is bonded above, below, and to the left to F's each with pairs of electron dots on the 3 sides without bonds; and to the right to N, which is bonded above, below, and to the right to H.