Your right about the last point. However I was wondering why you couldn't just flip the following acid base reactions around: NH3+H2O--> OH- +NH4+ and NH2CH3+H2O-->OH- + NH3CH3+ to make them NH4+ +OH- --> NH3 + H2O and NH3CH3+ +OH- --> NH2CH3+H2O. For the reversed reactions, the starting bases are the same (OH-), so in terms of reactivity, one could talk about the different acids and the stability of the conjugate base. In other words, why is the NH3 a more stable conjuate base than NH3CH3 or vice versa?