在线~~英语 1单复数互变2变否定句3般疑问句,并作肯定和否定回答

1.This bus is new.
This bus isn't new.
Is this bus new?Yes,it is / No,it isn't.
2.They're old
They aren't old
Are they old?Yes,they are / No,they aren't
3.It's an orange
It isn't an orange
Is it an orange?Yes,it is./ No,it isn't
4.That is my watch
That isn't my watch
Is that my watch?Yes,it is / No,it isn't
5.They are women teachers
They aren't women teachers
Are they women teachers?Yes,they are / No,they aren't