Here's why:

* Bonding pairs are formed by shared electrons. These electrons are attracted to the nuclei of both atoms involved in the bond. This attraction results in a covalent bond.

* Electrons carry a negative charge. So, while the shared electrons contribute to the overall electron density of the bond, they don't create a net positive or negative charge on the bonding pair itself.

* The bond can be polar or nonpolar. In a polar bond, the shared electrons are pulled more strongly towards one atom, creating a partial positive and partial negative charge on the atoms involved. However, the bonding pair itself still doesn't have a net charge.

In summary, bonding pairs are simply regions of high electron density due to shared electrons. They don't carry a positive or negative charge.