冰冻三尺，非一日之寒；滴水穿石，非一日之功。坚持一天一个中考英语词组，让你的英语稳步前进。知识讲解后搭配练习，让你掌握地更牢固！
all alone 单独、独自
【例句】
She was sitting all alone in the classroom. 她独自一人坐在教室里。
There being no one to help me, I had to do it all alone. 因为没有人帮助我，我不得不独立完成这项任务。
句型转换
She was sitting all alone in the classroom.（保持句意不变）
She was sitting all by ______ in the classroom.
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