句型转换:1.they are doing housework.(分别改成一般疑问句和否定句)2.the students are cleaning the classroom.(改为一般疑问句并作否定和肯定回答)

问题描述:

句型转换:1.they are doing housework.(分别改成一般疑问句和否定句)
2.the students are cleaning the classroom.(改为一般疑问句并作否定和肯定回答)

1Are they doing housework?They are not doing housework.
Are the students cleaning the classroom?.Yes,they are.
No,they aren't.