ゆきがふったので ______なりました （すべる）easy to slip
Why is the answer すべりやすく instead of すべりやすい
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I think I know the answer to this but I might be wrong.
When you have a noun that is transforming, it takes the particle に to mark the target of the transformation (なる).
An adjective can’t take the particle に, so instead the い transforms to くto serve the same function (‘conjugates’ to mark the target of the transformation).
Here’s a link:
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Hi!
This grammar point may answer your question:
This article may also be useful to close the circle on why it has to be く for an い-adjective:
HTH!
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Thank you!
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Another way to explain it is that やすい is the ‘adjective’ form, and やすく is the ‘adverb’ form.
やすい, as an adjective, would attach to nouns, whereas やすく, being an adverb, is used with verbs.
Since なりました is a verb, you would therefore use やすく, the adverb form.
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