回答
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My English ability in all four skills are steadily improving.
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My English ability in all four skills are showing steady signs of improvement.
"My English ability in all four skills are definitely improving.":
"My English ability"=「私の英語能力」
"in all four skills"=「四技能全て」
"are steadily improving"=「は着実に良くなっている」
"showing steady signs of improvement"=「順調な進歩のサインを見せている」