1.
I assure you of your award.
I ensure that he can get the award.
I have insured the car for 30,000$.
2.
better= improving
best= highest level
more= additional
most= can't add any more, is also highest level
best= highest level
more= additional
most= can't add any more, is also highest level
.
. best---One's nicest or most formal clothing.
most
1. formal The greatest amount or degree: She has the most to gain.
2. Slang The greatest, best, or most exciting. Used with the: That party was the most!
.Here I understand it is that slang is informal, maybe misused
