- Lewis acid: \(\mathrm{BeCl}_{2}, \mathrm{SO}_{3}, \mathrm{Na}^{+}\)
- Lewis base: \(\mathrm{NH}_{3}, \mathrm{O}^{2-}\)
\[
\boxed{\text{Lewis acid: } \mathrm{BeCl}_{2}, \mathrm{SO}_{3}, \mathrm{Na}^{+}}
\]
\[
\boxed{\text{Lewis base: } \mathrm{NH}_{3}, \mathrm{O}^{2-}}
\]