请大学生帮忙用英语造句！！

We finished the job all by ourselves.
我们全靠自己完成了这项工作。
Are you sure you did this exercise by yourself?
这个练习真是你自己做的吗?
Taken care of yourselves.
照顾你们自己
She lives by herself.
她独身一人生活
He said it himself.
他亲口说的
The cat is washing itself.
猫正在给自己洗脸

we like to make food by ourselves.我门喜欢自己做东西吃
you should do your homework by yourself.你功课要自己做。
why do you do it to yourself.你们为什么要对自己那么做？
she likes to sing by herself. 她喜欢自己唱歌
he likes to talk to himself. 他喜欢自己字言自语
its not the question itself.这不是问题的本身。