The answer applies the VSEPR theory rules from the text. For molecules without lone pairs on the central atom, the geometry directly follows the AB2, AB3, AB4, and AB5 arrangements (linear, trigonal planar, tetrahedral, and trigonal-bipyramidal). For molecules with lone pairs, the shape is distorted based on the lp-lp > lp-bp > bp-bp repulsion order, leading to bent shapes for AB2 types like H2S and trigonal-pyramidal shapes for AB3 types like PH3 (inferred from NH3).