Account for all the electrons in each of the following species, assuming sp3 hybridization of the second-row

Question:

Account for all the electrons in each of the following species, assuming sp3 hybridization of the second-row element in each case. Which electrons are found in sp3-hybridized orbitals? Which are found in _ bonds?
(a) Ammonia (NH3)
(e) Borohydride anion (BH4 -)
(b) Water (H2O)
(f) Amide anion (: NH2)
(c) Hydrogen fluoride (HF)
(g) Methyl anion (: CH3)
(d) Ammonium ion (NH4 +)