How do you plan to solve it?
module jk_ff_enable ( input CLK, input EN, input J, input K, output reg Q ); // Write your code here always @(posedge CLK) begin if(EN) begin if(~J&&K) begin Q<=0; end else if(J&&~K) begin Q<=1; end else if(J&&K) begin Q<=~Q; end end end endmodule