Using Interpreter Design Pattern in C#, Convert a Number to Words/Text

I am learning Design Patterns and Solid Principles. I have been asked to do a small program to convert the number to words using Interpreter Pattern and to apply all the required solid principles.

We have lot of examples in C# to write this program using a simple recursive method like converting numbers in to words C#

I just want to know the structure that has to be used in my program to implement Interpreter Pattern in this problem.