this is a pen.改为复数句
this is a pen.改为复数句
This is a pen.(改为复数形式)
This is a pen改为否定句,改为单复数转换改为一般疑问句或提问,肯定句做回答.
is this a red pen 改为复数句,并作肯定回答
What's this?It's a pen.(改为复数句)
Is this a bus (改为复数句
this is a pencil改为复数句
This is a shirt .改为复数句
this is a letter改为复数句
this is a tree 改为复数句
This is a pear.改为复数句
This is a dog :改为复数句