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The sentence is this one:

> おむすびがころころ転が **り** 穴におちてしまいました

Why is it 転がり instead of 転がる?

Also for a bonus question, I read in this forum site that てしまう means to make
emphasis on the ending of the action or for some embarrassing situation. Which
is the meaning on that example?
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2017-06-22T20:48:57.393
48667
2017-06-23T00:00:25.880
2017-06-22T20:54:04.637
19322
19322
question
grammar translation meaning
Why this verb isn't in the dictionary form?
To answer the first question, it is not in dictionary form because in formal
Japanese, or generally often in writing, it is customary to connect two
sentences using the "pre-masu form" that is, the -masu form without the ”ます”
(for example: 食べる → 食べ、 行く → 行き、 and in your case 転がる -> 転がり).

So in your case you could see this as the equivalent of putting an "and" after
the verb in English.

To answer the second question, as pointed out in a comment one way of thinking
about the -てしまう form sometimes is to see it as "Ended up...". Moreover in this
case we could imagine that "falling down a hole" represents a somehow
undesirable situation since after that point the rice ball might be lost. This
however, might depend on the context of course.
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2017-06-23T00:00:25.880
48671
2017-06-23T00:00:25.880
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answer