GRAMMARPOINT
avenge / revenge
People avenge something or avenge themselves on somebody: She vowed to avenge her brother's death.
* He later avenged himself on his wife's killers.
People revenge themselves on somebody or are revenged on them: He was later revenged on his wife's killers. You cannot revenge something: _S_h_e_ _v_o_w_e_d_ _t_o_ _r_e_v_e_n_g_e_ _h_e_r_ _b_r_o_t_h_e_r_'_s_ _d_e_a_t_h.
________________
|