“My English skills constantly fluctuate between improvement and deterioration.”
It's grammatical and understandable, and there's nothing wrong with it, but here's another version for your comparison. My English skills fluctuate between advancements and setbacks. CJ
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It's grammatical and understandable, and there's nothing wrong with it, but here's another version for your comparison.
My English skills fluctuate between advancements and setbacks.
CJ