将下面的句子改成一般疑问句和否定句

作业描述：They are doing housework.

作业解答:文章源自趣课程-https://www.qukecheng.com/1239.html

疑问句：Are they doing housework? 文章源自趣课程-https://www.qukecheng.com/1239.html

否定句：They are not doing housework.文章源自趣课程-https://www.qukecheng.com/1239.html

文章源自趣课程-https://www.qukecheng.com/1239.html 文章源自趣课程-https://www.qukecheng.com/1239.html