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 PRE or posedge RST)begin if(RST) Q <= 0; else if(PRE) Q <= 1'b1; else Q <= (T) ? ~Q : Q; end endmodule