Free Energy and Equilibrium Practice Test

For $\mathrm{X(aq) + Y(aq) \rightleftharpoons Z(aq)}$ at constant temperature, a student says: “If $\Delta G$ is negative, the reaction must already be at equilibrium.” Which statement best addresses this idea?

A student observes the reaction $\mathrm{2HF(aq) \rightleftharpoons H_2F_2(aq)}$ in solution at constant temperature. At one moment, $\Delta G<0$ for the reaction as written. Which statement best describes the system’s position relative to equilibrium?