How do you plan to solve it?
module jk_ff_enable ( input CLK, input EN, input J, input K, output reg Q ); always @(posedge CLK) begin if (EN) begin case ({J,K}) 2'b00 :Q<=Q; 2'b01 :Q<=0; 2'b10 :Q<=1; 2'b11 :Q<=~Q; endcase end else Q<=Q; end // Write your code here endmodule