1 This is a watch.改为否定句
This isn't a watch
2 This is my pencil 变为复数句
These are my pencils
3 It's this her eraser.作出肯定和否定回答
Yes,it is
No,it isn't
4 that ,is ,case,pencil ,his 连词成句
That is his pencil case
5 my name is bill green .写出同义句
I'm Bill Green
=Bill Green is my name