First person controller not moving properly after rotation

I have a First Person Controller that I move as follows:

 GameObject Person=GameObject.Find ("First Person Controller");

 if(GUI.RepeatButton(new Rect(moveForward), "")){
     Vector3 fwd = Person.transform.TransformDirection(Vector3.forward);
     Person.transform.Translate(fwd*timeDelta*10);
 
 }
         
 if(GUI.RepeatButton(new Rect(moveBackward), "")){
             
     Vector3 fwd = Person.transform.TransformDirection(Vector3.back);
     Person.transform.Translate(fwd*10*timeDelta);
 }
         
 if(GUI.RepeatButton(new Rect(turnLeft), "")){
             
     Person.transform.Rotate(0,-20*timeDelta,0);
 }
         
 if(GUI.RepeatButton(new Rect(turnRight), "")){
             
     Person.transform.Rotate(0,20*timeDelta,0);
 }

The problem is if I turn left and then move forward, the object moves as if I never turned left i.e all rotations are lost when I select move forward or move backward. Any help?