by myself

例句：

1. 1.I need to finish my homework by myself.
   我需要独自完成我的作业。
2. 2. She enjoys reading books by herself in the evening.
   她喜欢在晚上独自阅读书籍。
3. 3. He prefers to study by himself rather than with others.
   他更喜欢独自学习，而不是与他人一起。