可以用 "practicing self-study" 或 "engaging in self-study" 来表示 "锻炼自我英语"。这两个词组都是由动词 "practice" 或 "engage" 和名词 "self-study" 组成的。
"Practice" 是动词，意思是练习、锻炼。"Engage" 也是动词，意思是从事、参与。
"Self-study" 是名词，意思是自学、自我学习。
例句：
He is practicing self-study to improve his Engpsh skills.（他正在锻炼自我英语来提高他的英语技能。）
She engages in self-study every day to keep her Engpsh up to date.（她每天从事自我英语学习来保持她的英语水平。）
"Practice" 是动词，意思是练习、锻炼。"Engage" 也是动词，意思是从事、参与。
"Self-study" 是名词，意思是自学、自我学习。
例句：
He is practicing self-study to improve his Engpsh skills.（他正在锻炼自我英语来提高他的英语技能。）
She engages in self-study every day to keep her Engpsh up to date.（她每天从事自我英语学习来保持她的英语水平。）