How do you plan to solve it?
module t_ff_async_pr ( input CLK, input RST, input PRE, input T, output reg Q ); // Write your code here always @(posedge CLK or posedge RST or posedge PRE) begin if(RST) Q <= 0; else if (PRE) Q <= 1; else Q <= T?(~Q):Q; end endmodule