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I don't understand the 2nd check your understanding question. "Which morphemes do these pairs show allomorphy for?" THe third question is quite confusing as well since the last page stated suppletion must be memorized due to its unpredictability.
it always has to be memorized.
This is something that I think occurs quite a bit in the English language.
understand how words can be built out of morphemes in a given language.
This sounds interesting to me. I feel that there is a lot to learn about language and that could be a way to be more successful as a teacher.