Suppletions are the use of totally different words to show different forms of the same word.
Suppletions are interesting because they show how language can be surprising and creative.
Examples:
In English, 'go' and 'went' are an example of suppletions.
The words 'good' and 'better' are suppletions.
She uses suppletions when she says 'is' and 'was'.
The suppletions in this language are funny.
The suppletions in different languages are very interesting.
Suppletions make learning a language more fun.