In general I was wondering is there a “clue” that allows you to tell whether the reaction is first order or second order, (Usually it is same as the number of particles interacting on the rate-limiting step. - GS). I can easily differentiate between E and S reactions and can also tell when its SN1 or Sn2 when the reaction is written out even if only partially written out but I sm still struggling with which is which “verbally”?  (The best illustration is given by U.CAN. - GS).