Not sure what you are asking for, but,
Here is an example of a JRU (Join Result Unknown) word problem:
There were _____ kids on the playground. ____ more kids came onto the playground. How many kids are on the playground?
Here is an example of a JCU (Join Change Unknown) word problem:
There were ____ kids on the playground. Some more kids came on the playground. Now there are ____ kids on the playground. How many kids came on the playground?
Here is an example of a JSU (Join Start Unknown) word problem:
Some kids were on the playground. ____ kids came on the playground. Now there are ____ kids on the playground. How many kids were on the playground at the beginning?