How do you plan to solve it?
module sr_latch_enable ( input EN, input S, input R, output reg Q, output reg Qn ); always @(*)begin if(!EN)begin Q=Q; end else begin case({S,R}) 2'b00: Q=Q; 2'b01: Q=0; 2'b10: Q=1; 2'b11: Q=0; endcase end end always @(*)begin Qn=~Q; end endmodule