study on one's own
例句:
He studied these subjects on his own.
这些课程他是自学的。
2.learn by oneself
例句:
I taught myself how to play the piano.
我自学了弹钢琴。
——《柯林斯高阶英汉双解学习词典》
3.teach oneself
例句:
Training attentively students 'ability to analyse, solve problems and teach oneself.
注重培养学生分析、解决问题的能力和自学能力。
望采纳,谢谢!