单词：by yourself
你独自地
by yourself的用法和样例：
例句
- How long were you by yourself in the classroom?你独自一人在教室里多长时间了?
- Are you sure you did this exercise by yourself?这个练习真是你自己做的吗?
- Since you are already of age now, you should solve the problems by yourself.你已经成年了，这些问题要自己解决。
- You can't go mountain climbing by yourself.你不能自己去登山。
- I believe that you can work out this problem by yourself.我相信你自己能做出这道题的。