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# Amines behave as

$\begin{array}{1 1} \text{(a)Lewis acids} \\ \text{ (b) Lewis base} \\ \text{ (c) aprotic acid} \\ \text{ (d) neutral compound} \end{array}$

A lewis base is a species which can donate one or more electron pairs. $NH_3$ acts as lewis base because it has a lone pair of electrons on nitrogen which it can readily donate.